add getFloat()

object.c

@@ -253,6 +253,11 @@ oop makeFloat(flt_t value)
     return newFloat;
 }
 
+flt_t getFloat(oop obj)
+{
+    return get(obj, Float, _value);
+}
+
 oop makeString(char *value)
 {
     oop newString = malloc(sizeof(struct String));