Fix missing empty base optimization on MSVC

[marzer]

Fixes #60.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ed2d547) to head (2eb9a8b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #61   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          403       403           
=========================================
  Hits           403       403           

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[rollbear]

This looks good, but I don't understand what goes wrong with is_regular and diff.

[marzer]

Huh, me neither, this wasn't happening for me locally on my version of MSVC. I'll test it against a few additional versions of the toolchain and try to figure something out.

[marzer]

Alrighty @rollbear I've addressed this such that it passes locally on a couple of different MSVC toolchains, so should be ready to try again in your CI.

[rollbear]

Awesome! Thank you!