feat(type): support additional number types

At present, only Go float64 types are supported. Validating an integer in an
interface{} of an unsupported type currently displays an "unknown" type error.

This adds support for additional Go numeric types: uint, ints and float32s.

keywords_standard.go

@@ -145,7 +145,11 @@ func DataType(data interface{}) string {
 	switch reflect.TypeOf(data).Kind() {
 	case reflect.Bool:
 		return "boolean"
-	case reflect.Float64:
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+		reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return "integer"
+	case reflect.Float32, reflect.Float64:
 		number := reflect.ValueOf(data).Float()
 		if float64(int(number)) == number {
 			return "integer"

schema_test.go

@@ -579,7 +579,17 @@ func TestDataType(t *testing.T) {
 		{map[string]interface{}{}, "object"},
 		{struct{}{}, "object"},
 		{customObject{}, "object"},
-		{int8(42), "unknown"},
+		{uint8(42), "integer"},
+		{uint16(42), "integer"},
+		{uint32(42), "integer"},
+		{uint64(42), "integer"},
+		{int8(42), "integer"},
+		{int16(42), "integer"},
+		{int32(42), "integer"},
+		{int64(42), "integer"},
+		{float32(42), "integer"},
+		{float32(42.0), "integer"},
+		{float32(42.5), "number"},
 		// special cases which should pass with type hints
 		{"true", "boolean"},
 		{4.0, "number"},