Rewrote astish to recursion and shave some bytes

[RealPeha]

Rewrote astish function to recursion instead of while loop and shave some bytes

Size comparison

Before:

Wrote 1183 B: goober.cjs.gz
       1079 B: goober.cjs.br
Wrote 1188 B: goober.esm.js.gz
       1085 B: goober.esm.js.br
Wrote 1257 B: goober.umd.js.gz
       1137 B: goober.umd.js.br
Wrote 1188 B: goober.modern.js.gz
       1085 B: goober.modern.js.br

After:

Wrote 1185 B: goober.cjs.gz
       1078 B: goober.cjs.br
Wrote 1186 B: goober.esm.js.gz
       1090 B: goober.esm.js.br
Wrote 1252 B: goober.umd.js.gz
       1134 B: goober.umd.js.br
Wrote 1186 B: goober.modern.js.gz
       1090 B: goober.modern.js.br

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