fix compat breaking: revive workaround padding in decode() #3118

Job	Run time
rust-unit-test	4m 16s
shellcheck	9s
actionlint	16s
rust-lint	2m 23s
validate-cargo-lock	20s
build-and-test-java-api (windows-latest)	5m 19s
build-and-test-java-api (macos-latest)	2m 25s
build-and-test-java-api (ubuntu-latest)	2m 47s
build-and-test-python-api (windows-latest)	5m 27s
build-and-test-python-api (macos-latest)	3m 11s
build-and-test-python-api (ubuntu-latest)	2m 57s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 33s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 31s
build-windows-cpp-example	3m 39s
c-header	41s
rust-integration-test-strategy-matrix	3s
rust-integration-test (macos-12)	2m 7s
rust-integration-test (ubuntu-20.04)	1m 28s
	40m 32s

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