Some reverts

Author: fhammerschmidt

packages/@rescript/runtime/Stdlib_Intl_DateTimeFormat.res

@@ -35,16 +35,17 @@ type formatMatcher = [#basic | #"best fit"]
 type fractionalSecondDigits = [#0 | #1 | #2 | #3]
 
 type options = {
-  dateStyle?: dateStyle,
-  timeStyle?: timeStyle,
+  dateStyle?: dateStyle, // can be used with timeStyle, but not other options
+  timeStyle?: timeStyle, // can be used with dateStyle, but not other options
   calendar?: Stdlib_Intl_Common.calendar,
-  dayPeriod?: dayPeriod,
+  dayPeriod?: dayPeriod, // only has an effect if a 12-hour clock is used
   numberingSystem?: Stdlib_Intl_Common.numberingSystem,
   localeMatcher?: Stdlib_Intl_Common.localeMatcher,
   timeZone?: string,
   hour12?: bool,
   hourCycle?: hourCycle,
   formatMatcher?: formatMatcher,
+  // date-time components
   weekday?: weekday,
   era?: era,
   year?: year,

packages/@rescript/runtime/Stdlib_Intl_Segments.res

@@ -1,5 +1,7 @@
 /***
 Bindings to `Segments` objects produced by `Intl.Segmenter.segment`.
+ A Segments instance is an object that represents the segments of a specific string, subject to the locale and options of its constructing Intl.Segmenter instance.
+https://tc39.es/ecma402/#sec-segments-objects.
 
 See [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Segmenter/segment) for API details and the [ECMA-402 specification](https://tc39.es/ecma402/#sec-segments-objects) for the object shape.
 */

packages/@rescript/runtime/Stdlib_WeakMap.res

@@ -50,7 +50,7 @@ See [`WeakMap.prototype.has`](https://developer.mozilla.org/en-US/docs/Web/JavaS
 let cache = Stdlib_WeakMap.make()
 let key = Stdlib_Object.make()
 Stdlib_WeakMap.has(cache, key) == false
-let _ = Stdlib_WeakMap.set(cache, key)
+let _ = Stdlib_WeakMap.set(cache, key, ())
 Stdlib_WeakMap.has(cache, key) == true
 ```
 */