According to CONTRIBUTING.md,

Don't use C++ style comments

 /* This is the prefered comment style */

Use C++ style comments only for temporary comment e.g. commenting out some code lines.

Please add me to the author.

mrb_fiber_yield() is available now; you have to link mruby-fiber mrbgem to use the function; there's no function available to create new fiber from C (countapart of Lua's lua_newthread), but that's because you cannot create a new fiber from C due to mruby C API design limitation. define your method to create fibers in Ruby; close #1269

Implement sprintf("%c") for UTF-8.

The string is "Hello world" in Japanese.  (hat tip:  Google Translate.)

fix SEGV bug for mrb_str_new_static

mrb_str_new_static causes seg-fault when 3rd argument is negative.

fix SEGV bug for mrb_str_new

mrb_str_new causes seg-fault when 3rd argument is negative.

Add mruby-strip tool to strip irep's debug info.

make mrb_str_dump a bit faster

move check condition to outside in while block

Refactor tests in kernel.rb

use mrb_str_cat_lit() intead of mrb_str_cat

Add test for Kernel#instance_variable_defined?

Could you add me to AUTHORS?

* sprintf("%c") is changed to accept a string for which String#size returns
  1, even if it is longer than one byte, and to convert a Fixnum via
  Fixnum#chr (possibly returning more than one byte).  Thus, if the UTF-8
  gem is in use, a character will be understood as a single UTF-8 character.

* The change to sprintf depends on the implementation of Fixnum#chr added
  to mrbgems/mruby-string-utf8/src/string.c.

This should work with any other gem that implements a multibyte encoding, as
long as it implements String#size and Fixnum#chr as appropriate.

Delete `!!Notice!!` intro paragraph from README

It's become misleading since the release of 1.0.0 and the launch of mruby.org.

revert 38e9ce21 and API changed; mrb_get_backtrace() -> renamed to mrb_exc_backtrace since this is a backtrace method implementation of Exception; mrb_get_backtrace_at() -> removed; mrb_get_backtrace() -> added to get backtrace in array (like caller)