Implemented boolean literals

src/types/Common.go

@@ -4,6 +4,7 @@ var (
 	Any        = &Base{name: "any", size: 0}
 	AnyArray   = &Array{Of: Any}
 	AnyPointer = &Pointer{To: Any}
+	Bool       = &Base{name: "bool", size: 1}
 	Int64      = &Base{name: "int64", size: 8}
 	Int32      = &Base{name: "int32", size: 4}
 	Int16      = &Base{name: "int16", size: 2}
@@ -14,7 +15,6 @@ var (
 )
 
 var (
-	Bool   = Int
 	Byte   = UInt8
 	Int    = Int64
 	Float  = Float64

src/types/Is.go

@@ -25,8 +25,12 @@ func Is(a Type, b Type) bool {
 		return true
 	}
 
-	// Temporary hack for implicit casts
-	if a.Size() > b.Size() {
+	// Temporary hacks
+	if a == Int32 && b == Int64 {
+		return true
+	}
+
+	if a == Int64 && b == Int32 {
 		return true
 	}