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https://developers.home-assistant.io/blog/2025/03/25/frozen-unit-system
UnitSystem dataclass is now frozen | Home Assistant Developer Docs
UnitSystem class is changed to a frozen data class, and all instances derived from it are now frozen.
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UnitSystem dataclass is now frozen | Home Assistant Developer Docs
https://developers.home-assistant.io/blog/2025/03/25/frozen-unit-system
UnitSystem class is changed to a frozen data class, and all instances derived from it are now frozen.
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UnitSystem dataclass is now frozen | Home Assistant Developer Docs
UnitSystem class is changed to a frozen data class, and all instances derived from it are now frozen.
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