Issue #6083 has been updated by Yui NARUSE.


Binary hackers can handle C structs even if it is a hidden private struct.
So it should be enough simply to declare "struct RBignunm is not a public API".
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Feature #6083: Hide a Bignum definition
https://bugs.ruby-lang.org/issues/6083

Author: Koichi Sasada
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 2.0.0


Now, the struct RBignum which is a definition of Bignum in C is located in include/ruby/ruby.h.  It means we can't change implementation of Bignum.  For example, using GMP as Bignum representation.

I propose to move the struct RBignum definition from include/ruby/ruby.h to bignum.c.  I believe no one use struct RBignum directly (except core).

It has possibility to break binary compatibility.




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