Carl Osterwisch 211d1b7041
fix toSI() wrongly converting degC (#3118)
* Add new test for degC toSI

* Convert value using to() if needed

* Only set ret.value = null when it is not already null

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Co-authored-by: Jos de Jong <wjosdejong@gmail.com>
2024-01-12 11:07:15 +01:00
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