What a field's WRITE path accepts: the input schema's raw side when the def
kept its concrete schema type (satisfies FieldDef<...>, never an
annotation), else the parsed value type. The conservative fallback means an
annotated def demands parsed-shaped writes rather than accepting anything.
What a field's WRITE path accepts: the input schema's raw side when the def kept its concrete schema type (
satisfies FieldDef<...>, never an annotation), else the parsed value type. The conservative fallback means an annotated def demands parsed-shaped writes rather than accepting anything.