util: improve textencoder encodeInto performance #1205

Job	Run time
Build slim tarball	1m 30s
x86_64-linux: with shared libraries	11m 18s
aarch64-darwin: with shared libraries	31m 18s
x86_64-darwin: with shared libraries	1h 24m 1s
aarch64-linux: with shared libraries	8m 43s
	2h 16m 50s

Provide feedback