Speedup for Uint8Array.from(jsArrayWithUint8Elements)

[Reve]

I'm writing a protobuf serializer 
Here's some ideas for writing to a buffer that I have come up with:
https://github.com/js-benchmark-all/micro/blob/main/src/binary/serialize.case.ts

And benchmark results of each idea:
https://github.com/js-benchmark-all/micro/blob/main/results/binary/serialize.v8.txt

Is it possible to speed up any of the 1 pass ideas, for example by making Uint8Array.from() not copy the data from the built array?

[Claudia]

The copy is required by spec: https://tc39.es/ecma262/multipage/indexed-collections.html#sec-settypedarrayfromarraylike