fix: allow length of 0

[mint-dewit]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

• Other information:

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (69bc9e7) 67.81% compared to head (02d082d) 67.81%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   67.81%   67.81%           
=======================================
  Files           5        5           
  Lines         435      435           
  Branches       82       82           
=======================================
  Hits          295      295           
  Misses        129      129           
  Partials       11       11           

Files	Coverage Δ
src/serializers.ts	52.08% <100.00%> (ø)

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