feat: add OrNull constructors#1
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Generic OrNull[T] + typed constructors: StringOrNull, IntOrNull, Int32OrNull, Int16OrNull, FloatOrNull, BoolOrNull, ByteOrNull, TimeOrNull. Eliminates boilerplate helpers in DB/API projects.
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Summary
OrNull[T comparable]— zero value → null mapping for any comparable typeStringOrNull,IntOrNull,Int32OrNull,Int16OrNull,FloatOrNull,BoolOrNull,ByteOrNull,TimeOrNulloptStr()/optInt()helpers in DB/API projectsDocumentation
Test plan
TestOrNull_Generic— int, string zero/non-zeroTestStringOrNull— empty/non-emptyTestIntOrNull— 0/42/-1TestInt32OrNull,TestInt16OrNull— 0/42TestFloatOrNull— 0.0/3.14TestBoolOrNull— false(null)/true(valid)TestByteOrNull— 0/42TestTimeOrNull— zero time/nowgo vetclean,gofmtclean