fix compat breaking: revive workaround padding in decode() #3095

Job	Run time
shellcheck	9s
rust-lint	1m 35s
actionlint	12s
validate-cargo-lock	23s
build-and-test-java-api (windows-latest)	6m 37s
build-and-test-python-api (windows-latest)	7m 43s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 30s
build-and-test-java-api (macos-latest)	2m 38s
build-and-test-python-api (macos-latest)	3m 6s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 37s
build-and-test-java-api (ubuntu-latest)	3m 5s
build-and-test-python-api (ubuntu-latest)	3m 4s
build-windows-cpp-example	4m 7s
c-header	42s
rust-integration-test-strategy-matrix	1s
rust-unit-test	5m 12s
rust-integration-test (macos-12)	2m 14s
rust-integration-test (ubuntu-20.04)	1m 22s
	45m 17s

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