`mrb_obj_iv_inspect()` is an internal implementation function and is not called by any function other than `mrb_obj_inspect()`.

Summary of Changes

Hello @dearblue, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the internal implementation of object inspection in mruby. It streamlines the code by merging a specialized internal function directly into its sole caller and relocating associated helper logic, aiming to improve code organization and maintainability without altering the external behavior of object inspection.

Highlights

Code Refactoring: The internal helper function mrb_obj_iv_inspect() has been eliminated. Its logic, which was only ever called by mrb_obj_inspect(), has been directly inlined into mrb_obj_inspect() to simplify the codebase and remove an unnecessary abstraction.
Code Relocation: The inspect_i struct and its corresponding static callback function inspect_i, which are essential for iterating and formatting instance variables during object inspection, have been moved from src/variable.c to src/kernel.c. This co-locates them with the mrb_obj_inspect() function, which now directly utilizes them.

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Comment on lines +78 to +85

		else {
		mrb_str_cat_lit(mrb, a->str, ", ");
		}
		s = mrb_sym_name_len(mrb, sym, &len);
		mrb_str_cat(mrb, a->str, s, len);
		mrb_str_cat_lit(mrb, a->str, "=");
		ins = mrb_inspect(mrb, v);
		mrb_str_cat_str(mrb, a->str, ins);