fix: conversions in Number->to_decimal

Author: R-unic

examples/code_challenges/flipped_bits.⭐

@@ -80,8 +80,8 @@ class Cosmo::Intrinsic::Numbers
     def call(args : Array(ValueType)) : Num
       t = token("Number->to_decimal")
       TypeChecker.assert("int", @_self, t)
-      TypeChecker.assert("int", args.first, t)
-      @_self.to_s.to_i(args.first.as Int)
+      TypeChecker.assert("uint", args.first, t)
+      @_self.to_s.to_i64(args.first.as Int)
     end
   end
 

src/cosmo/runtime/intrinsic/number.cr

@@ -181,7 +181,18 @@ module Cosmo::TypeChecker
       if value.is_a?(Bool)
         value ? 1 : 0
       else
-        value.to_u64
+        value.to_i64.to_u64
+      end
+    elsif is?(type.lexeme, 1_i128, type) && (
+      value.is_a?(String) || value.is_a?(Char) ||
+      value.is_a?(Float) || value.is_a?(Int) ||
+      value.is_a?(Bool)
+    ) # if the type is an integer
+
+      if value.is_a?(Bool)
+        value ? 1_i128 : 0_i128
+      else
+        value.to_i128
       end
     elsif is?(type.lexeme, 1, type) && (
       value.is_a?(String) || value.is_a?(Char) ||