protect stack size even further

[chrisnojima]

Hi,

Sorry to touch this same area again! Turns out my previous fix wasn't enough for most use cases. In isolation reducing it by 4 was enough to pass tests but if your code is running on any kind of stack itself you'll run out of stack space. Looking at what some other projects do it seems pretty popular to just change this value to give yourself some headroom (like: https://github.com/feross/buffer/blob/master/index.js#L1023)

[codecov-io]

Codecov Report

Merging #90 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          16       16           
  Lines         962      962           
  Branches      196      196           
=======================================
  Hits          946      946           
  Misses         16       16

Impacted Files	Coverage Δ
src/utils/utf8.ts	96.8% <100%> (ø)	⬆️

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[gfx]

I think the available stack size varies in browsers, but yes the current size is too big. Thanks for your efforts.

[gfx]

Released as v1.9.3.