Fix DEFAULT_PARSERCONTEXT, speed up parsing.

[Zentrik]

Unfortunately this was never updated in #280 to be the correct default, and so has been wrong ever since that pr.

#263 suggest significant improvements, I don't see as big an improvement but still substantial.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (48e4b21) 99.35% compared to head (bd341d2) 99.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files           7        7           
  Lines         466      466           
=======================================
  Hits          463      463           
  Misses          3        3           

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[Zentrik]

Bump