Fix bugs in assign

[aguschin]

close #256

[codecov-commenter]

Codecov Report

Base: 80.91% // Head: 81.52% // Increases project coverage by +0.60% 🎉

Coverage data is based on head (856f95c) compared to base (691ca4b).
Patch coverage: 92.30% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
+ Coverage   80.91%   81.52%   +0.60%     
==========================================
  Files          16       16              
  Lines        1886     1867      -19     
==========================================
- Hits         1526     1522       -4     
+ Misses        360      345      -15     

Impacted Files	Coverage Δ
gto/config.py	95.65% <ø> (-0.14%)	⬇️
gto/cli.py	70.33% <86.20%> (+0.76%)	⬆️
gto/registry.py	74.67% <88.88%> (+1.40%)	⬆️
gto/api.py	90.98% <100.00%> (+12.72%)	⬆️
gto/base.py	84.80% <100.00%> (-0.59%)	⬇️
gto/constants.py	100.00% <100.00%> (ø)
gto/_version.py	36.36% <0.00%> (-45.46%)	⬇️
gto/ext.py	71.05% <0.00%> (-0.75%)	⬇️
gto/ui.py	83.01% <0.00%> (-0.62%)	⬇️
... and 6 more

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