Add test for #456 and fix bitflags glob import

[juntyr]

Adds a test for #456, which was fixed in #455, and fixes CI.

* [ ] I've included my change in CHANGELOG.md

[codecov-commenter]

Codecov Report

Patch coverage: 94.73% and project coverage change: -0.87 ⚠️

Comparison is base (ec889b5) 86.52% compared to head (ae15d5d) 85.65%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
- Coverage   86.52%   85.65%   -0.87%     
==========================================
  Files          61       61              
  Lines        7983     7760     -223     
==========================================
- Hits         6907     6647     -260     
- Misses       1076     1113      +37     

Impacted Files	Coverage Δ
tests/152_bitflags.rs	46.47% <0.00%> (-5.58%)	⬇️
src/de/mod.rs	75.13% <100.00%> (ø)
tests/115_minimal_flattening.rs	100.00% <100.00%> (ø)

... and 42 files with indirect coverage changes

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