This fixes the following in my environment:
misc/expand_tabs.rb:29:in `=~': invalid byte sequence in US-ASCII (ArgumentError)
This switches from =~ to start_with? as a regular expression is
not actually needed here.
This is implemented to close [Misc #16112] because all other options got
at least one objection, and nobody has objected to this solution.
This code is a little complicated for the purpose, but that's just
because it includes some historical code for auto-style.rb:
918a7c31b6/bin/auto-style.rb
Please feel free to improve this file as you like.
[Misc #16112]
