Allow matchdef of tag:tagprop for layer.syncIndexEvents

[jnwatson]

No description provided.

[codecov]

Codecov Report

Merging #2010 (4ced635) into master (3a88346) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
- Coverage   96.83%   96.67%   -0.17%     
==========================================
  Files         147      147              
  Lines       28742    28742              
==========================================
- Hits        27832    27785      -47     
- Misses        910      957      +47     

Flag	Coverage Δ
linux	96.67% <ø> (-0.17%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/layer.py	98.09% <ø> (-0.07%)	⬇️
synapse/tests/utils.py	93.64% <0.00%> (-2.17%)	⬇️
synapse/lib/spawn.py	96.50% <0.00%> (-0.96%)	⬇️
synapse/cortex.py	95.79% <0.00%> (-0.76%)	⬇️
synapse/lib/hiveauth.py	96.05% <0.00%> (-0.76%)	⬇️
synapse/lib/view.py	94.19% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/lmdbslab.py	99.40% <0.00%> (-0.20%)	⬇️

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[invisig0th]

would it potentially worth memoizing this string construction (here and any other obvious ones) to cut down on new objects in the tight loop?