tweak ival norm to auto-expand 0 length intervals

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #2070 (ac0524d) into master (ebe37a9) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2070      +/-   ##
==========================================
- Coverage   96.87%   96.73%   -0.14%     
==========================================
  Files         149      149              
  Lines       29556    29558       +2     
==========================================
- Hits        28632    28594      -38     
- Misses        924      964      +40     

Flag	Coverage Δ
linux	96.73% <100.00%> (-0.14%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/types.py	97.48% <100.00%> (+<0.01%)	⬆️
synapse/tests/utils.py	93.68% <0.00%> (-2.16%)	⬇️
synapse/lib/hiveauth.py	96.06% <0.00%> (-0.75%)	⬇️
synapse/lib/view.py	94.18% <0.00%> (-0.70%)	⬇️
synapse/cortex.py	95.91% <0.00%> (-0.68%)	⬇️
synapse/lib/link.py	98.03% <0.00%> (-0.66%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/layer.py	98.06% <0.00%> (-0.07%)	⬇️
synapse/lib/lmdbslab.py	99.60% <0.00%> (+0.19%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ebe37a9...ac0524d. Read the comment docs.