Support move of BlockVec to LazyArrays

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.05%. Comparing base (33fdfc4) to head (b829f2e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   84.17%   84.05%   -0.13%     
==========================================
  Files           7        7              
  Lines        1321     1323       +2     
==========================================
  Hits         1112     1112              
- Misses        209      211       +2     

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