Use rb_define_alias instead of rb_define_method for rb_cHash
The main reason for using
rb_define_alias is generating more prefer Document and making code more readable.
Is there any reason
rb_define_method is prefered to
If so, please let me know :)
If not so, I'm gonna do same thing for other part of code.
I've sorted some methods in terms of
rb_define_alias being very after original.