Performance decreased between head vs v0.3.1

[georgelemon]

Hey,

I'm using your awesome package to pack/unpack big AST (ref nodes) in Bro package, a wip stylesheet language (alternative to SASSC / DartSass, SassJS.)

Unpacking 114mb with v0.3.1:
0.734594596

Unpacking the same file with #head version:
1.201364966

I'm using cpuTime() to get the numbers

[jangko]

hmm, probably because of nim std streams.