implement string

builtins.simple

@@ -34,6 +34,8 @@ object inttrait:
 
     def tobool:
         self $int_tobool
+    def tostr:
+        self $int_tostr
 
 # Project: Boolean
 object booltrait:
@@ -46,3 +48,21 @@ object booltrait:
 
     def toint:
         self $bool_toint
+    def tostr:
+        self $bool_tostr
+
+# Project: String
+object strtrait:
+    def eq(other):
+        self $str_eq(other)
+    def add(other):
+        self $str_add(other)
+    def rev:
+        self $str_rev
+    def len:
+        self $str_len
+
+    def tobool:
+        self $str_tobool
+    def toint:
+        self $str_toint