diff --git a/.vendor.txt b/.vendor.txt
index ffa32106..835bc364 100644
--- a/.vendor.txt
+++ b/.vendor.txt
@@ -3,7 +3,7 @@
     ./_vendor/src/golang.org/x/crypto                        3cb07270c9455e8ad27956a70891c962d121a228  https://go.googlesource.com/crypto
     ./_vendor/src/golang.org/x/tools                         620ecdb8d7943e20dc030b61bfe898d1b000bdea  https://go.googlesource.com/tools
     ./_vendor/src/github.com/jteeuwen/go-bindata             a0ff2567cfb70903282db057e799fd826784d41d  git@github.com:jteeuwen/go-bindata
-    ./_vendor/src/github.com/gopherjs/gopherjs               e14987c0ef06db387b90fec85e8d06dc05598e24  git@github.com:gopherjs/gopherjs
+    ./_vendor/src/github.com/gopherjs/gopherjs               91be9d3fa503472d6ccde719f7ec6923dfb18699  git@github.com:gopherjs/gopherjs
     ./_vendor/src/github.com/gopherjs/jsbuiltin              67703bfb044e3192fbcab025c3aeaeedafad1f2f  git@github.com:gopherjs/jsbuiltin
     ./_vendor/src/github.com/kisielk/gotool                  0de1eaf82fa3f583ce21fde859f1e7e0c5e9b220  git@github.com:kisielk/gotool
     ./_vendor/src/github.com/fsnotify/fsnotify               7d7316ed6e1ed2de075aab8dfc76de5d158d66e1  git@github.com:fsnotify/fsnotify
diff --git a/_vendor/src/github.com/gopherjs/gopherjs/compiler/expressions.go b/_vendor/src/github.com/gopherjs/gopherjs/compiler/expressions.go
index 42fe624b..49ebbab2 100644
--- a/_vendor/src/github.com/gopherjs/gopherjs/compiler/expressions.go
+++ b/_vendor/src/github.com/gopherjs/gopherjs/compiler/expressions.go
@@ -812,6 +812,11 @@ func (c *funcContext) makeReceiver(e *ast.SelectorExpr) *expression {
 
 	_, isPointer := recvType.Underlying().(*types.Pointer)
 	methodsRecvType := sel.Obj().Type().(*types.Signature).Recv().Type()
+
+	if _, isInterface := methodsRecvType.Underlying().(*types.Interface); isInterface {
+		return c.formatExpr("$copyInterfaceVal(%e)", x)
+	}
+
 	_, pointerExpected := methodsRecvType.(*types.Pointer)
 	if !isPointer && pointerExpected {
 		recvType = types.NewPointer(recvType)
@@ -825,6 +830,7 @@ func (c *funcContext) makeReceiver(e *ast.SelectorExpr) *expression {
 	if isWrapped(recvType) {
 		recv = c.formatExpr("new %s(%s)", c.typeName(methodsRecvType), recv)
 	}
+
 	return recv
 }
 
@@ -1130,12 +1136,17 @@ func (c *funcContext) translateImplicitConversion(expr ast.Expr, desiredType typ
 			// wrap JS object into js.Object struct when converting to interface
 			return c.formatExpr("new $jsObjectPtr(%e)", expr)
 		}
+
+		switch exprType.Underlying().(type) {
+		case *types.Array:
+			return c.formatExpr("new %1s($clone(%e, %1s))", c.typeName(exprType), expr)
+		case *types.Struct:
+			return c.formatExpr("new %1e.constructor.elem($clone(%1e, %s))", expr, c.typeName(exprType))
+		}
+
 		if isWrapped(exprType) {
 			return c.formatExpr("new %s(%e)", c.typeName(exprType), expr)
 		}
-		if _, isStruct := exprType.Underlying().(*types.Struct); isStruct {
-			return c.formatExpr("new %1e.constructor.elem(%1e)", expr)
-		}
 	}
 
 	return c.translateExpr(expr)
diff --git a/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/jsmapping.go b/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/jsmapping.go
index dc29cba6..2ffc7cf8 100644
--- a/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/jsmapping.go
+++ b/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/jsmapping.go
@@ -163,10 +163,10 @@ var $externalizeFunction = function(v, t, passThis) {
       case 0:
         return;
       case 1:
-        return $externalize(result, t.results[0]);
+        return $externalize($copyInterfaceVal(result), t.results[0]);
       default:
         for (var i = 0; i < t.results.length; i++) {
-          result[i] = $externalize(result[i], t.results[i]);
+          result[i] = $externalize($copyInterfaceVal(result[i]), t.results[i]);
         }
         return result;
       }
diff --git a/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/prelude.go b/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/prelude.go
index 0cae7d70..45106eda 100644
--- a/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/prelude.go
+++ b/_vendor/src/github.com/gopherjs/gopherjs/compiler/prelude/prelude.go
@@ -4,7 +4,7 @@ const Prelude = prelude + numeric + types + goroutines + jsmapping
 
 // Minified is Prelude ran through UglifyJS 3 via https://skalman.github.io/UglifyJS-online/
 // with default options.
-const Minified = `var $global,$module;if(Error.stackTraceLimit=1/0,"undefined"!=typeof window?$global=window:"undefined"!=typeof self?$global=self:"undefined"!=typeof global?($global=global).require=require:$global=this,void 0===$global||void 0===$global.Array)throw new Error("no global object found");"undefined"!=typeof module&&($module=module);var $throwRuntimeError,$packages={},$idCounter=0,$keys=function(e){return e?Object.keys(e):[]},$flushConsole=function(){},$throwNilPointerError=function(){$throwRuntimeError("invalid memory address or nil pointer dereference")},$call=function(e,n,r){return e.apply(n,r)},$makeFunc=function(e){return function(){return $externalize(e(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}},$unused=function(e){},$mapArray=function(e,n){for(var r=new e.constructor(e.length),t=0;t<e.length;t++)r[t]=n(e[t]);return r},$methodVal=function(e,n){var r=e.$methodVals||{};e.$methodVals=r;var t=r[n];if(void 0!==t)return t;var i=e[n];return t=function(){$stackDepthOffset--;try{return i.apply(e,arguments)}finally{$stackDepthOffset++}},r[n]=t,t},$methodExpr=function(e,n){var r=e.prototype[n];return void 0===r.$expr&&(r.$expr=function(){$stackDepthOffset--;try{return e.wrapped&&(arguments[0]=new e(arguments[0])),Function.call.apply(r,arguments)}finally{$stackDepthOffset++}}),r.$expr},$ifaceMethodExprs={},$ifaceMethodExpr=function(e){var n=$ifaceMethodExprs["$"+e];return void 0===n&&(n=$ifaceMethodExprs["$"+e]=function(){$stackDepthOffset--;try{return Function.call.apply(arguments[0][e],arguments)}finally{$stackDepthOffset++}}),n},$subslice=function(e,n,r,t){void 0===r&&(r=e.$length),void 0===t&&(t=e.$capacity),(n<0||r<n||t<r||r>e.$capacity||t>e.$capacity)&&$throwRuntimeError("slice bounds out of range");var i=new e.constructor(e.$array);return i.$offset=e.$offset+n,i.$length=r-n,i.$capacity=t-n,i},$substring=function(e,n,r){return(n<0||r<n||r>e.length)&&$throwRuntimeError("slice bounds out of 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e[n]},set:function(r){e[n]=r}}}(n.elem.fields[i].prop);(r=Object.create(n.prototype,t)).$val=r,e.$proxies[n.string]=r,r.$proxies=e.$proxies}return r},$append=function(e){return $internalAppend(e,arguments,1,arguments.length-1)},$appendSlice=function(e,n){if(n.constructor===String){var r=$stringToBytes(n);return $internalAppend(e,r,0,r.length)}return $internalAppend(e,n.$array,n.$offset,n.$length)},$internalAppend=function(e,n,r,t){if(0===t)return e;var i=e.$array,a=e.$offset,o=e.$length+t,$=e.$capacity;if(o>$)if(a=0,$=Math.max(o,e.$capacity<1024?2*e.$capacity:Math.floor(5*e.$capacity/4)),e.$array.constructor===Array){(i=e.$array.slice(e.$offset,e.$offset+e.$length)).length=$;for(var c=e.constructor.elem.zero,u=e.$length;u<$;u++)i[u]=c()}else(i=new e.$array.constructor($)).set(e.$array.subarray(e.$offset,e.$offset+e.$length));$copyArray(i,n,a+e.$length,r,t,e.constructor.elem);var l=new e.constructor(i);return 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range"),this.$elem=e,this.$capacity=n,this.$buffer=[],this.$sendQueue=[],this.$recvQueue=[],this.$closed=!1},$chanNil=new $Chan(null,0);$chanNil.$sendQueue=$chanNil.$recvQueue={length:0,push:function(){},shift:function(){},indexOf:function(){return-1}};var $funcTypes={},$funcType=function(e,n,r){var t=$mapArray(e,function(e){return e.id}).join(",")+"$"+$mapArray(n,function(e){return e.id}).join(",")+"$"+r,i=$funcTypes[t];if(void 0===i){var a=$mapArray(e,function(e){return e.string});r&&(a[a.length-1]="..."+a[a.length-1].substr(2));var o="func("+a.join(", ")+")";1===n.length?o+=" "+n[0].string:n.length>1&&(o+=" ("+$mapArray(n,function(e){return e.string}).join(", ")+")"),i=$newType(4,$kindFunc,o,!1,"",!1,null),$funcTypes[t]=i,i.init(e,n,r)}return i},$interfaceTypes={},$interfaceType=function(e){var n=$mapArray(e,function(e){return e.pkg+","+e.name+","+e.typ.id}).join("$"),r=$interfaceTypes[n];if(void 0===r){var t="interface {}";0!==e.length&&(t="interface { "+$mapArray(e,function(e){return(""!==e.pkg?e.pkg+".":"")+e.name+e.typ.string.substr(4)}).join("; ")+" }"),r=$newType(8,$kindInterface,t,!1,"",!1,null),$interfaceTypes[n]=r,r.init(e)}return r},$emptyInterface=$interfaceType([]),$ifaceNil={},$error=$newType(8,$kindInterface,"error",!0,"",!1,null);$error.init([{prop:"Error",name:"Error",pkg:"",typ:$funcType([],[$String],!1)}]);var $panicValue,$jsObjectPtr,$jsErrorPtr,$mapTypes={},$mapType=function(e,n){var r=e.id+"$"+n.id,t=$mapTypes[r];return void 0===t&&(t=$newType(4,$kindMap,"map["+e.string+"]"+n.string,!1,"",!1,null),$mapTypes[r]=t,t.init(e,n)),t},$makeMap=function(e,n){for(var r={},t=0;t<n.length;t++){var i=n[t];r[e(i.k)]=i}return r},$ptrType=function(e){var n=e.ptr;return void 0===n&&(n=$newType(4,$kindPtr,"*"+e.string,!1,"",e.exported,null),e.ptr=n,n.init(e)),n},$newDataPointer=function(e,n){return n.elem.kind===$kindStruct?e:new n(function(){return e},function(n){e=n})},$indexPtr=function(e,n,r){return e.$ptr=e.$ptr||{},e.$ptr[n]||(e.$ptr[n]=new r(function(){return e[n]},function(r){e[n]=r}))},$sliceType=function(e){var n=e.slice;return void 0===n&&(n=$newType(12,$kindSlice,"[]"+e.string,!1,"",!1,null),e.slice=n,n.init(e)),n},$makeSlice=function(e,n,r){r=r||n,(n<0||n>2147483647)&&$throwRuntimeError("makeslice: len out of range"),(r<0||r<n||r>2147483647)&&$throwRuntimeError("makeslice: cap out of range");var t=new e.nativeArray(r);if(e.nativeArray===Array)for(var i=0;i<r;i++)t[i]=e.elem.zero();var a=new e(t);return a.$length=n,a},$structTypes={},$structType=function(e,n){var r=$mapArray(n,function(e){return e.name+","+e.typ.id+","+e.tag}).join("$"),t=$structTypes[r];if(void 0===t){var i="struct { "+$mapArray(n,function(e){return e.name+" "+e.typ.string+(""!==e.tag?' "'+e.tag.replace(/\\/g,"\\\\").replace(/"/g,'\\"')+'"':"")}).join("; ")+" }";0===n.length&&(i="struct {}"),t=$newType(0,$kindStruct,i,!1,"",!1,function(){this.$val=this;for(var e=0;e<n.length;e++){var r=n[e],t=arguments[e];this[r.prop]=void 0!==t?t:r.typ.zero()}}),$structTypes[r]=t,t.init(e,n)}return t},$assertType=function(e,n,r){var t,i=n.kind===$kindInterface,a="";if(e===$ifaceNil)t=!1;else if(i){var o=e.constructor.string;if(void 0===(t=n.implementedBy[o])){t=!0;for(var $=$methodSet(e.constructor),c=n.methods,u=0;u<c.length;u++){for(var l=c[u],s=!1,f=0;f<$.length;f++){var d=$[f];if(d.name===l.name&&d.pkg===l.pkg&&d.typ===l.typ){s=!0;break}}if(!s){t=!1,n.missingMethodFor[o]=l.name;break}}n.implementedBy[o]=t}t||(a=n.missingMethodFor[o])}else t=e.constructor===n;if(!t){if(r)return[n.zero(),!1];$panic(new $packages.runtime.TypeAssertionError.ptr("",e===$ifaceNil?"":e.constructor.string,n.string,a))}return i||(e=e.$val),n===$jsObjectPtr&&(e=e.object),r?[e,!0]:e},$stackDepthOffset=0,$getStackDepth=function(){var e=new Error;if(void 0!==e.stack)return $stackDepthOffset+e.stack.split("\n").length},$panicStackDepth=null,$callDeferred=function(e,n,r){if(!r&&null!==e&&e.index>=$curGoroutine.deferStack.length)throw n;if(null!==n){var t=null;try{$curGoroutine.deferStack.push(e),$panic(new $jsErrorPtr(n))}catch(e){t=e}return $curGoroutine.deferStack.pop(),void $callDeferred(e,t)}if(!$curGoroutine.asleep){$stackDepthOffset--;var i=$panicStackDepth,a=$panicValue,o=$curGoroutine.panicStack.pop();void 0!==o&&($panicStackDepth=$getStackDepth(),$panicValue=o);try{for(;;){if(null===e&&void 0===(e=$curGoroutine.deferStack[$curGoroutine.deferStack.length-1])){if($panicStackDepth=null,o.Object instanceof Error)throw o.Object;var $;throw $=o.constructor===$String?o.$val:void 0!==o.Error?o.Error():void 0!==o.String?o.String():o,new Error($)}var c=e.pop();if(void 0===c){if($curGoroutine.deferStack.pop(),void 0!==o){e=null;continue}return}var u=c[0].apply(c[2],c[1]);if(u&&void 0!==u.$blk){if(e.push([u.$blk,[],u]),r)throw null;return}if(void 0!==o&&null===$panicStackDepth)throw null}}finally{void 0!==o&&(null!==$panicStackDepth&&$curGoroutine.panicStack.push(o),$panicStackDepth=i,$panicValue=a),$stackDepthOffset++}}},$panic=function(e){$curGoroutine.panicStack.push(e),$callDeferred(null,null,!0)},$recover=function(){return null===$panicStackDepth||void 0!==$panicStackDepth&&$panicStackDepth!==$getStackDepth()-2?$ifaceNil:($panicStackDepth=null,$panicValue)},$throw=function(e){throw e},$noGoroutine={asleep:!1,exit:!1,deferStack:[],panicStack:[]},$curGoroutine=$noGoroutine,$totalGoroutines=0,$awakeGoroutines=0,$checkForDeadlock=!0,$mainFinished=!1,$go=function(e,n){$totalGoroutines++,$awakeGoroutines++;var r=function(){try{$curGoroutine=r;var t=e.apply(void 0,n);if(t&&void 0!==t.$blk)return e=function(){return t.$blk()},void(n=[]);r.exit=!0}catch(e){if(!r.exit)throw e}finally{$curGoroutine=$noGoroutine,r.exit&&($totalGoroutines--,r.asleep=!0),r.asleep&&($awakeGoroutines--,!$mainFinished&&0===$awakeGoroutines&&$checkForDeadlock&&(console.error("fatal error: all goroutines are asleep - deadlock!"),void 0!==$global.process&&$global.process.exit(2)))}};r.asleep=!1,r.exit=!1,r.deferStack=[],r.panicStack=[],$schedule(r)},$scheduled=[],$runScheduled=function(){try{for(var e;void 0!==(e=$scheduled.shift());)e()}finally{$scheduled.length>0&&setTimeout($runScheduled,0)}},$schedule=function(e){e.asleep&&(e.asleep=!1,$awakeGoroutines++),$scheduled.push(e),$curGoroutine===$noGoroutine&&$runScheduled()},$setTimeout=function(e,n){return $awakeGoroutines++,setTimeout(function(){$awakeGoroutines--,e()},n)},$block=function(){$curGoroutine===$noGoroutine&&$throwRuntimeError("cannot block in JavaScript callback, fix by wrapping code in goroutine"),$curGoroutine.asleep=!0},$send=function(e,n){e.$closed&&$throwRuntimeError("send on closed channel");var r=e.$recvQueue.shift();if(void 0===r){if(!(e.$buffer.length<e.$capacity)){var t,i=$curGoroutine;return e.$sendQueue.push(function(e){return t=e,$schedule(i),n}),$block(),{$blk:function(){t&&$throwRuntimeError("send on closed channel")}}}e.$buffer.push(n)}else r([n,!0])},$recv=function(e){var n=e.$sendQueue.shift();void 0!==n&&e.$buffer.push(n(!1));var r=e.$buffer.shift();if(void 0!==r)return[r,!0];if(e.$closed)return[e.$elem.zero(),!1];var t=$curGoroutine,i={$blk:function(){return this.value}};return e.$recvQueue.push(function(e){i.value=e,$schedule(t)}),$block(),i},$close=function(e){for(e.$closed&&$throwRuntimeError("close of closed channel"),e.$closed=!0;;){var n=e.$sendQueue.shift();if(void 0===n)break;n(!0)}for(;;){var r=e.$recvQueue.shift();if(void 0===r)break;r([e.$elem.zero(),!1])}},$select=function(e){for(var n=[],r=-1,t=0;t<e.length;t++){var i,a=(i=e[t])[0];switch(i.length){case 0:r=t;break;case 1:(0!==a.$sendQueue.length||0!==a.$buffer.length||a.$closed)&&n.push(t);break;case 2:a.$closed&&$throwRuntimeError("send on closed channel"),(0!==a.$recvQueue.length||a.$buffer.length<a.$capacity)&&n.push(t)}}if(0!==n.length&&(r=n[Math.floor(Math.random()*n.length)]),-1!==r)switch((i=e[r]).length){case 0:return[r];case 1:return[r,$recv(i[0])];case 2:return $send(i[0],i[1]),[r]}var o=[],$=$curGoroutine,c={$blk:function(){return this.selection}},u=function(){for(var e=0;e<o.length;e++){var n=o[e],r=n[0],t=r.indexOf(n[1]);-1!==t&&r.splice(t,1)}};for(t=0;t<e.length;t++)!function(n){var r=e[n];switch(r.length){case 1:var t=function(e){c.selection=[n,e],u(),$schedule($)};o.push([r[0].$recvQueue,t]),r[0].$recvQueue.push(t);break;case 2:t=function(){return r[0].$closed&&$throwRuntimeError("send on closed channel"),c.selection=[n],u(),$schedule($),r[1]};o.push([r[0].$sendQueue,t]),r[0].$sendQueue.push(t)}}(t);return $block(),c},$needsExternalization=function(e){switch(e.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return!1;default:return e!==$jsObjectPtr}},$externalize=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return e;case $kindInt64:case $kindUint64:return $flatten64(e);case $kindArray:return $needsExternalization(n.elem)?$mapArray(e,function(e){return $externalize(e,n.elem)}):e;case $kindFunc:return $externalizeFunction(e,n,!1);case $kindInterface:return e===$ifaceNil?null:e.constructor===$jsObjectPtr?e.$val.object:$externalize(e.$val,e.constructor);case $kindMap:for(var r={},t=$keys(e),i=0;i<t.length;i++){var a=e[t[i]];r[$externalize(a.k,n.key)]=$externalize(a.v,n.elem)}return r;case $kindPtr:return e===n.nil?null:$externalize(e.$get(),n.elem);case $kindSlice:return $needsExternalization(n.elem)?$mapArray($sliceToArray(e),function(e){return $externalize(e,n.elem)}):$sliceToArray(e);case $kindString:if($isASCII(e))return e;var o,$="";for(i=0;i<e.length;i+=o[1]){var c=(o=$decodeRune(e,i))[0];if(c>65535){var u=Math.floor((c-65536)/1024)+55296,l=(c-65536)%1024+56320;$+=String.fromCharCode(u,l)}else $+=String.fromCharCode(c)}return $;case $kindStruct:var s=$packages.time;if(void 0!==s&&e.constructor===s.Time.ptr){var f=$div64(e.UnixNano(),new $Int64(0,1e6));return new Date($flatten64(f))}var d={},p=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindPtr:return e===n.nil?d:p(e.$get(),n.elem);case $kindStruct:var r=n.fields[0];return p(e[r.prop],r.typ);case $kindInterface:return p(e.$val,e.constructor);default:return d}},h=p(e,n);if(h!==d)return h;h={};for(i=0;i<n.fields.length;i++){var k=n.fields[i];k.exported&&(h[k.name]=$externalize(e[k.prop],k.typ))}return h}$throwRuntimeError("cannot externalize "+n.string)},$externalizeFunction=function(e,n,r){return e===$throwNilPointerError?null:(void 0===e.$externalizeWrapper&&($checkForDeadlock=!1,e.$externalizeWrapper=function(){for(var t=[],i=0;i<n.params.length;i++){if(n.variadic&&i===n.params.length-1){for(var a=n.params[i].elem,o=[],$=i;$<arguments.length;$++)o.push($internalize(arguments[$],a));t.push(new n.params[i](o));break}t.push($internalize(arguments[i],n.params[i]))}var c=e.apply(r?this:void 0,t);switch(n.results.length){case 0:return;case 1:return $externalize(c,n.results[0]);default:for(i=0;i<n.results.length;i++)c[i]=$externalize(c[i],n.results[i]);return c}}),e.$externalizeWrapper)},$internalize=function(e,n,r){if(n===$jsObjectPtr)return e;if(n===$jsObjectPtr.elem&&$throwRuntimeError("cannot internalize js.Object, use *js.Object instead"),e&&void 0!==e.__internal_object__)return $assertType(e.__internal_object__,n,!1);var t=$packages.time;if(void 0!==t&&n===t.Time)return null!=e&&e.constructor===Date||$throwRuntimeError("cannot internalize time.Time from "+typeof e+", must be Date"),t.Unix(new $Int64(0,0),new $Int64(0,1e6*e.getTime()));switch(n.kind){case $kindBool:return!!e;case $kindInt:return parseInt(e);case $kindInt8:return parseInt(e)<<24>>24;case $kindInt16:return parseInt(e)<<16>>16;case $kindInt32:return parseInt(e)>>0;case $kindUint:return parseInt(e);case $kindUint8:return parseInt(e)<<24>>>24;case $kindUint16:return parseInt(e)<<16>>>16;case $kindUint32:case $kindUintptr:return parseInt(e)>>>0;case $kindInt64:case $kindUint64:return new n(0,e);case $kindFloat32:case $kindFloat64:return parseFloat(e);case $kindArray:return e.length!==n.len&&$throwRuntimeError("got array with wrong size from JavaScript native"),$mapArray(e,function(e){return $internalize(e,n.elem)});case $kindFunc:return function(){for(var t=[],i=0;i<n.params.length;i++){if(n.variadic&&i===n.params.length-1){for(var a=n.params[i].elem,o=arguments[i],$=0;$<o.$length;$++)t.push($externalize(o.$array[o.$offset+$],a));break}t.push($externalize(arguments[i],n.params[i]))}var c=e.apply(r,t);switch(n.results.length){case 0:return;case 1:return $internalize(c,n.results[0]);default:for(i=0;i<n.results.length;i++)c[i]=$internalize(c[i],n.results[i]);return c}};case $kindInterface:if(0!==n.methods.length&&$throwRuntimeError("cannot internalize "+n.string),null===e)return $ifaceNil;if(void 0===e)return new $jsObjectPtr(void 0);switch(e.constructor){case Int8Array:return new($sliceType($Int8))(e);case Int16Array:return new($sliceType($Int16))(e);case Int32Array:return new($sliceType($Int))(e);case Uint8Array:return new($sliceType($Uint8))(e);case Uint16Array:return new($sliceType($Uint16))(e);case Uint32Array:return new($sliceType($Uint))(e);case Float32Array:return new($sliceType($Float32))(e);case Float64Array:return new($sliceType($Float64))(e);case Array:return $internalize(e,$sliceType($emptyInterface));case Boolean:return new $Bool(!!e);case Date:return void 0===t?new $jsObjectPtr(e):new t.Time($internalize(e,t.Time));case Function:var i=$funcType([$sliceType($emptyInterface)],[$jsObjectPtr],!0);return new i($internalize(e,i));case Number:return new $Float64(parseFloat(e));case String:return new $String($internalize(e,$String));default:if($global.Node&&e instanceof $global.Node)return new $jsObjectPtr(e);var a=$mapType($String,$emptyInterface);return new a($internalize(e,a))}case $kindMap:for(var o={},$=$keys(e),c=0;c<$.length;c++){var u=$internalize($[c],n.key);o[n.key.keyFor(u)]={k:u,v:$internalize(e[$[c]],n.elem)}}return o;case $kindPtr:if(n.elem.kind===$kindStruct)return $internalize(e,n.elem);case $kindSlice:return new n($mapArray(e,function(e){return $internalize(e,n.elem)}));case $kindString:if(e=String(e),$isASCII(e))return e;var l="";for(c=0;c<e.length;){var s=e.charCodeAt(c);if(55296<=s&&s<=56319){var f=e.charCodeAt(c+1);l+=$encodeRune(1024*(s-55296)+f-56320+65536),c+=2}else l+=$encodeRune(s),c++}return l;case $kindStruct:var d={},p=function(n){if(n===$jsObjectPtr)return e;switch(n===$jsObjectPtr.elem&&$throwRuntimeError("cannot internalize js.Object, use *js.Object instead"),n.kind){case $kindPtr:return p(n.elem);case $kindStruct:var r=n.fields[0],t=p(r.typ);if(t!==d){var i=new n.ptr;return i[r.prop]=t,i}return d;default:return d}},h=p(n);if(h!==d)return h}$throwRuntimeError("cannot internalize "+n.string)},$isASCII=function(e){for(var n=0;n<e.length;n++)if(e.charCodeAt(n)>=128)return!1;return!0};`
 
 const prelude = `Error.stackTraceLimit = Infinity;
 
@@ -297,6 +297,14 @@ var $clone = function(src, type) {
   return clone;
 };
 
+var $copyInterfaceVal = function(src) {
+	if (src.constructor.copy) {
+		return new src.constructor($clone(src.$val, src.constructor));
+	}
+
+	return src;
+};
+
 var $pointerOfStructConversion = function(obj, type) {
   if(obj.$proxies === undefined) {
     obj.$proxies = {};
diff --git a/_vendor/src/github.com/gopherjs/gopherjs/tests/interface_test.go b/_vendor/src/github.com/gopherjs/gopherjs/tests/interface_test.go
new file mode 100644
index 00000000..80960387
--- /dev/null
+++ b/_vendor/src/github.com/gopherjs/gopherjs/tests/interface_test.go
@@ -0,0 +1,88 @@
+package tests
+
+import (
+	"fmt"
+	"testing"
+)
+
+type Struct struct {
+	Name string
+}
+
+func (s Struct) SetName(n string) {
+	s.Name = n
+}
+
+type SetName interface {
+	SetName(n string)
+}
+
+func TestAssignStructValInterface(t *testing.T) {
+	s := Struct{
+		Name: "Rob",
+	}
+
+	var i1 interface{} = s
+	var i2 interface{} = i1
+
+	s.Name = "Pike"
+
+	ss := fmt.Sprintf("%#v", s)
+	i1s := fmt.Sprintf("%#v", i1)
+	i2s := fmt.Sprintf("%#v", i2)
+
+	if exp := "tests.Struct{Name:\"Pike\"}"; ss != exp {
+		t.Fatalf("ss should have been %q; got %q", exp, ss)
+	}
+
+	iexp := "tests.Struct{Name:\"Rob\"}"
+
+	if i1s != iexp {
+		t.Fatalf("is should have been %q; got %q", iexp, i1s)
+	}
+
+	if i2s != iexp {
+		t.Fatalf("is should have been %q; got %q", iexp, i2s)
+	}
+}
+
+func TestStructValInterfaceMethodCall(t *testing.T) {
+	var i SetName = Struct{
+		Name: "Rob",
+	}
+
+	i.SetName("Pike")
+
+	is := fmt.Sprintf("%#v", i)
+
+	if exp := "tests.Struct{Name:\"Rob\"}"; is != exp {
+		t.Fatalf("is should have been %q; got %q", exp, is)
+	}
+}
+
+func TestAssignArrayInterface(t *testing.T) {
+	a := [2]int{1, 2}
+
+	var i1 interface{} = a
+	var i2 interface{} = i1
+
+	a[0] = 0
+
+	as := fmt.Sprintf("%#v", a)
+	i1s := fmt.Sprintf("%#v", i1)
+	i2s := fmt.Sprintf("%#v", i2)
+
+	if exp := "[2]int{0, 2}"; as != exp {
+		t.Fatalf("ss should have been %q; got %q", exp, as)
+	}
+
+	iexp := "[2]int{1, 2}"
+
+	if i1s != iexp {
+		t.Fatalf("is should have been %q; got %q", iexp, i1s)
+	}
+
+	if i2s != iexp {
+		t.Fatalf("is should have been %q; got %q", iexp, i2s)
+	}
+}