William Taysom

A sound and complete type for Enumerable#inject

1

Kicking the wheels on RBS, Enumerable#inject seemed a good method to start with. I [see](https://github.com/ruby/rbs/blob/2250961e1f9987ff4e67caf38f7a5d077a830cea/core/enumerable.rbs#L882) its block form as `() { (Elem, Elem) -> Elem } -> Elem`. Though matching...

I ran across it in these two spots: ``` /.rbenv/versions/2.7.3/lib/ruby/gems/2.7.0/gems/nmatrix-0.2.4/lib/nmatrix/shortcuts.rb:203: warning: Using the last argument as keyword parameters is deprecated /.rbenv/versions/2.7.3/lib/ruby/gems/2.7.0/gems/nmatrix-0.2.4/lib/nmatrix/shortcuts.rb:233: warning: Using the last argument as keyword parameters is...