Replace impossible case in switch with Assert(false)

[jeltz]

This case cannot be hit since the switch is exhaustive so replace it with an Assert(false).

PG-0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.48%. Comparing base (81ca012) to head (237660f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #829      +/-   ##
==========================================
+ Coverage   88.46%   88.48%   +0.01%     
==========================================
  Files           3        3              
  Lines        1318     1320       +2     
  Branches      187      187              
==========================================
+ Hits         1166     1168       +2     
  Misses         77       77              
  Partials       75       75              

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