👌 Improve performance of "text" inline rule

[hukkin]

This slightly deviates from JavaScript, but improves performance a lot.

Below the before/after results from tox -e py312-bench-core.

Before:

------------------------------------------ benchmark 'core': 1 tests ------------------------------------------
Name (time in ms)         Min      Max     Mean  StdDev   Median     IQR  Outliers      OPS  Rounds  Iterations
---------------------------------------------------------------------------------------------------------------
test_spec             80.6105  90.4756  83.9440  4.1692  81.2779  7.7111       4;0  11.9127      12           1
---------------------------------------------------------------------------------------------------------------

After:

------------------------------------------ benchmark 'core': 1 tests ------------------------------------------
Name (time in ms)         Min      Max     Mean  StdDev   Median     IQR  Outliers      OPS  Rounds  Iterations
---------------------------------------------------------------------------------------------------------------
test_spec             74.6913  84.1540  78.3273  3.9836  75.6576  8.0403       4;0  12.7669      13           1
---------------------------------------------------------------------------------------------------------------

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.25%. Comparing base (1a43fa3) to head (50c9f07).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #347   +/-   ##
=======================================
  Coverage   95.24%   95.25%           
=======================================
  Files          64       64           
  Lines        3431     3436    +5     
=======================================
+ Hits         3268     3273    +5     
  Misses        163      163           

Flag	Coverage Δ
pytests	95.25% <100.00%> (+<0.01%)	⬆️

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[chrisjsewell]

yeh looks good cheers