Fixes to encoding/transcoding for ractors. #2094

Job	Run time
cargo test	36s
make (check, --enable-yjit, --yjit)	6m 9s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	11m 14s
YJIT macOS Arm64 result	3s
	18m 2s

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