Feature request: v.nullish(someValidator)
Equivalent to this:
Because I often CBA whether an input is null or undefined :lul: so many data sources will just decide whether to do one or the other
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I'd find this convenient too, here are some raw thoughts:
We've likely want
v.nullable(x) which means v.union(v.null(), x). Then for nullish need to figure out how other languages are going to deal with a type that is optional and nullable; in Rust for example this could lead to significantly more complicated codegen for the argument struct where a field is both nullable and optional. Or maybe nullish is a special validator that accepts null or optional, but always spits out null — then codegen in other languages doesn't need to be able to represent both. We don't have any validators that transform values like this yet, but it's a natural extension if the tradeoffs feel right.
For now this should be a userland extension, which makes it a little ugly (t.nullish() or similar) but should work fine.