RecordKeys shold only care about output

[msanchezdev]

Because keys are always strings in Javascript, a record will never parse when the schema specifies it should be a number.

const schema = z.record(z.number(), z.number());
schema.parse({ 1: 100, 2: 88, 3: 99, 4: 60 })

A workaround or the right way would be to coerce the number instead:

const schema = z.record(z.coerce.number(), z.number());
schema.parse({ 1: 100, 2: 88, 3: 99, 4: 60 })

Only problem being the record throwing type error as the coerced number doesnt have a number input.

This seems to be okay as the number type doesnt leek anywhere it should not:

z.record(z.coerce.number(), z.number()) // Record<number, number>
Object.keys(result); // string[]
Object.entries(result); // [string, number][]
for (const key /*: string */ in result) {

}

I am aware of the docs mentioning using string for record keys (image below) but I think we can embrace using coerced number without problem (or any other schema that outputs a valid key).

Asserts:

• Impossible parsing of z.record(z.number(), z.any()) #5521
• v4: Records cannot have z.number keys #4383
• z.coerce.string() not usable in record key for zod v4 #4665

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[msanchezdev]

@colinhacks I'm interested in this comment of yours in #4665 (comment), and would like to know if there is something I'm missing that would make this change not viable.