fix compat breaking: revive workaround padding in decode() #3084

Job	Run time
actionlint	13s
build-and-test-java-api (windows-latest)	7m 20s
build-and-test-python-api (windows-latest)	8m 0s
build-and-test-java-api (macos-latest)	3m 51s
build-and-test-python-api (macos-latest)	5m 36s
build-and-test-java-api (ubuntu-latest)	3m 6s
build-and-test-python-api (ubuntu-latest)	3m 54s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 32s
build-windows-cpp-example	4m 39s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 32s
c-header	1m 7s
rust-integration-test-strategy-matrix	8s
rust-lint	2m 55s
rust-unit-test	3m 16s
shellcheck	20s
validate-cargo-lock	24s
rust-integration-test (macos-12)	2m 2s
rust-integration-test (ubuntu-20.04)	1m 28s
	51m 23s

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