fix(schema): handle number discriminator keys when using Schema.prototype.discriminator()
#13858
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Fix #13788
Summary
#13788 pointed out that we have an issue where
Schema.prototype.discriminator()
doesn't handle number discriminator keys correctly. Mostly because that function uses a POJO to store the future discriminator keys, which means numeric keys get converted to strings. This PR makesSchema.prototype._applyDiscriminators
use a map instead to retain numbers.Examples