Require use of deepcopy of storage nodes

[invisig0th]

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[codecov]

Codecov Report

Merging #2031 (8bad266) into master (5ca0611) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2031      +/-   ##
==========================================
- Coverage   96.76%   96.62%   -0.15%     
==========================================
  Files         148      148              
  Lines       29124    29126       +2     
==========================================
- Hits        28183    28144      -39     
- Misses        941      982      +41     

Flag	Coverage Δ
linux	96.62% <100.00%> (-0.15%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/cortex.py	95.75% <100.00%> (-0.76%)	⬇️
synapse/lib/layer.py	98.24% <100.00%> (-0.12%)	⬇️
synapse/lib/msgpack.py	98.38% <100.00%> (+0.05%)	⬆️
synapse/lib/node.py	97.79% <100.00%> (-0.02%)	⬇️
synapse/lib/snap.py	94.82% <100.00%> (-0.02%)	⬇️
synapse/lib/storm.py	98.03% <100.00%> (ø)
synapse/lib/stormtypes.py	97.84% <100.00%> (ø)
synapse/lib/view.py	94.22% <100.00%> (-0.67%)	⬇️
synapse/tests/utils.py	93.66% <0.00%> (-2.16%)	⬇️
... and 5 more

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