Paweł Pacana

> Would it be possible to add some filtering on the created_at attribute Filtering on timestamps needed some groundwork and it has been just recently done: https://github.com/RailsEventStore/rails_event_store/pull/674. Let's say it...

> I wounder if in addition to having the option to define the configuration file location, we need to support multiple config files. Or config file inheritance. The only reason...

> Curious why you do not want a project specific config file, and want to configure everything via flags? Simply put — presence and sunk cost of existing tooling

> From my perspective, RES would still use the Makefile to trigger mutant, but not have to re-implement a mutant config file format anymore. I need to evaluate that option

This is no longer an issue for me, closing.

It has been stated that mutant does not support Ruby below version 2.5: - https://github.com/mbj/mutant/blob/dcf6b8d562d11996b0249659e2cec12cf811ecef/Changelog.md#v0819-2018-11-06 and https://github.com/mbj/mutant/blob/dcf6b8d562d11996b0249659e2cec12cf811ecef/Changelog.md#v0822-2018-12-04

> And #match? does not exist for Ruby 2.3. Btw. Ruby 2.3 is going EOL by the [end of March](https://www.ruby-lang.org/en/downloads/branches/) and (not yet released) Rails 6.0 is going to require...

I now understand why this would be very useful — transitioning to running mutant on Ruby 2.7, which delivered lots of syntactic sugar:

I had simillar idea once when spawning processes to wait on something like: - specific text in stdout - socket readiness - ability to respond to request Have a look...

Not sure if still an issue, in [RES](https://github.com/RailsEventStore/rails_event_store/blob/14d73c0ea3ad6d1bcbf2724d242feff80d52956e/ruby_event_store/spec/client_subscriptions_spec.rb#L387-L403) we've been using http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/Exchanger.html to synchronize threaded tests.