Error when creating JSONSchema from Schema.Record with Schema.Number as key

Is it expected that i can not make a JSONSchema from Schema.Record({ key: Schema.Number, value: Schema.String } when using Schema.Number ?
const f = JSONSchema.make(Schema.Record({ key: Schema.Number, value: Schema.String }))
console.log(f)

gives me:
Unsupported key schema
schema (NumberKeyword): number`
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