fix compat breaking: revive workaround padding in decode() #3110

Job	Run time
shellcheck	10s
validate-cargo-lock	21s
actionlint	12s
build-and-test-python-api (windows-latest)	7m 17s
build-and-test-java-api (windows-latest)	7m 19s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 37s
build-and-test-python-api (macos-latest)	5m 27s
build-and-test-java-api (macos-latest)	2m 26s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 41s
build-and-test-python-api (ubuntu-latest)	2m 58s
build-and-test-java-api (ubuntu-latest)	2m 49s
build-windows-cpp-example	4m 28s
c-header	45s
rust-integration-test-strategy-matrix	1s
rust-lint	4m 35s
rust-unit-test	4m 24s
rust-integration-test (macos-12)	2m 32s
rust-integration-test (ubuntu-20.04)	1m 44s
	50m 46s

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