Added support for unions as a step towards lowering ADTs in the next pass to be written.

stdlib/string.krak

@@ -4,6 +4,9 @@ import mem
 import serialize
 import io
 
+fun to_string(in: bool): string
+    if (in) return string("true")
+    else return string("false")
 fun to_string(in: uchar): string
     return to_string_num(in)
 fun to_string(in: short): string
@@ -168,6 +171,7 @@ obj string (Object, Serializable) {
     }
 
     fun operator+(integer: int): string return *this + to_string(integer);
+    fun operator+(b: bool): string return *this + to_string(b);
 
     fun operator+(str: *char): string {
         var newStr.construct(str):string
@@ -181,6 +185,7 @@ obj string (Object, Serializable) {
     }
 
     fun operator+=(integer: int) *this += to_string(integer);
+    fun operator+=(b: bool) *this += to_string(b);
 
     fun operator+=(character: char): void {
         data += character