Assert that vec length is at least LENGTH.

[brndnmtthws]

This resolves #23.

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[codecov]

Codecov Report

Merging #24 (99c4261) into main (d1e92f5) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

❗ Current head 99c4261 differs from pull request most recent head 137b80c. Consider uploading reports for the commit 137b80c to get more accurate results

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   65.36%   65.34%   -0.02%     
==========================================
  Files          44       44              
  Lines        3164     3168       +4     
==========================================
+ Hits         2068     2070       +2     
- Misses       1096     1098       +2     

Impacted Files	Coverage Δ
src/types.rs	46.87% <50.00%> (+0.08%)	⬆️

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