BRAND Record to Non Partial

[Hiroshiba]

This PR is an artifact of the discussion.
#2069 (reply in thread)

A Record keyed by string, number or symbol is Non Partial, but BRAND (which should behave similarly) is Partial.
This PR ensures that a key with BRAND will also be Non Partial.

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[colinhacks]

Looks good!

[wdanilo]

It doesn't work:

const zodKey = Z.string().brand('zodKey')
const zodRecord = Z.record(zodKey, Z.number())
type ZodRecord = Z.infer<typeof zodRecord>

still infers as possibly undefined values. Is there maybe a regression @colinhacks? @Hiroshiba I don't see any tests in your PR, was it working with this example when you were submitting it?

[fwoelffel]

I am also observing this unexpected behaviour where using a branded type as the record key would result in a partial record 🤔