But yes, ble.sh also has a shell parser in shell, although it uses a state machine style that's more principled than bash regex / sed crap.
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Also, distro build systems like Alpine Linux and others tend to parse shell in shell (or with sed).
They often need package metadata without executing package builds, so they do that by trying to parse shell.
In YSH, you will be able to do that with reflection, basically like Lisp/Python/Ruby, rather than ad hoc parsing.
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I'm glad to hear you can see the effect of the optimizations ! That took a long time :-)
Some more benchmarks here, which I'll write about: https://oils.pub/release/0.33.0/benchmarks.wwz/osh-runtime/
