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

```diff @@ 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