Fix a hang in uinvalidated

[timholy]

Picked up as the source of hanging in the doctests. Also updates doctests to reduce the number of errors.

[codecov]

Codecov Report

Base: 82.26% // Head: 83.63% // Increases project coverage by +1.37% 🎉

Coverage data is based on head (8a131a1) compared to base (fa775b3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
+ Coverage   82.26%   83.63%   +1.37%     
==========================================
  Files          17       17              
  Lines        2176     2188      +12     
==========================================
+ Hits         1790     1830      +40     
+ Misses        386      358      -28     

Impacted Files	Coverage Δ
src/parcel_snoopc.jl	78.15% <ø> (+5.04%)	⬆️
src/parcel_snoopi_deep.jl	90.01% <ø> (+0.53%)	⬆️
src/invalidations.jl	74.06% <100.00%> (+1.68%)	⬆️
src/deep_demos.jl	58.97% <0.00%> (-3.19%)	⬇️
src/parcel_snoopi.jl	95.00% <0.00%> (+3.33%)	⬆️
SnoopPrecompile/src/SnoopPrecompile.jl	94.11% <0.00%> (+3.49%)	⬆️
SnoopCompileCore/src/snoopi.jl	55.73% <0.00%> (+8.46%)	⬆️

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