util: improve textencoder encodeInto performance #1142

Job	Run time
Build slim tarball	1m 23s
x86_64-linux: with shared libraries	1m 22s
aarch64-linux: with shared libraries	1m 16s
x86_64-darwin: with shared libraries	1m 31s
aarch64-darwin: with shared libraries	1m 24s
	6m 56s

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