- added `_out` and `_out_bufsize` validator [346](https://github.com/amoffat/sh/issues/346) - bugfix for internal stdout thread running when it shouldn't [346](https://github.com/amoffat/sh/issues/346)
1.12.6
- regression bugfix on timeout [344](https://github.com/amoffat/sh/issues/344) - regression bugfix on `_ok_code=None`
1.12.5
- further improvements on cpu usage
1.12.4
- regression in cpu usage [339](https://github.com/amoffat/sh/issues/339)
1.12.3
- fd leak regression and fix for flawed fd leak detection test [337](https://github.com/amoffat/sh/pull/337)