add untyped array methods to postgresdata + fix #42 (#67)

* add untyped array methods to PostgresData

* test fluent integration

* add test for #42

Author: tanner0101

Sources/PostgresNIO/Data/PostgresData+Int.swift

@@ -115,6 +115,12 @@ private extension PostgresData {
         switch self.formatCode {
         case .binary:
             switch self.type {
+            case .char, .bpchar:
+                assert(value.readableBytes == 1)
+                guard let uint8 = value.getInteger(at: value.readerIndex, as: UInt8.self) else {
+                    return nil
+                }
+                return I(uint8)
             case .int2:
                 assert(value.readableBytes == 2)
                 guard let int16 = value.readInteger(as: Int16.self) else {

Tests/PostgresNIOTests/PostgresNIOTests.swift

@@ -979,6 +979,19 @@ final class PostgresNIOTests: XCTestCase {
         XCTAssertEqual(rows[0].column("doubles")?.array(of: Double.self), doubles)
     }
 
+    // https://github.com/vapor/postgres-nio/issues/42
+    func testUInt8Serialization() throws {
+        let conn = try PostgresConnection.test(on: eventLoop).wait()
+        defer { try! conn.close().wait() }
+        let rows = try conn.query("""
+        select
+            $1::char as int
+        """, [
+            .init(uint8: 5)
+        ]).wait()
+        XCTAssertEqual(rows[0].column("int")?.uint8, 5)
+    }
+
 }