fix: don't slow EMA smoother across zero-crossings for high alpha #701

Job	Run time
lint	18s
validate (3.13)	56s
validate (3.11)	54s
validate (3.12)	40s
validate (3.10)	43s
build-addon (linux/arm64, addon-linux-arm64) / build	39s
build (linux/amd64, base-linux-amd64) / build	29s
build-addon (linux/amd64, addon-linux-amd64) / build	30s
build (linux/arm/v7, base-linux-arm-v7) / build	32s
build (linux/arm64, base-linux-arm64) / build	53s
merge-addon / merge	26s
merge / merge	26s
	7m 26s

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