chore: highlight user-defined value types

[antico5]

Closes #420

[codecov-commenter]

Codecov Report

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@@              Coverage Diff               @@
##             development     #428   +/-   ##
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  Coverage               ?   55.44%           
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  Files                  ?      177           
  Lines                  ?     4502           
  Branches               ?      742           
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  Hits                   ?     2496           
  Misses                 ?     1774           
  Partials               ?      232           

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[kanej]

LGTM!