new_quant_param with discrete values shouldn't require range

[jonthegeek]

The values argument to new_quant_param overrides the range, but new_quant_param (and everything I've checked downstream, such as value_seq) manipulates and validates the range before checking if values is set. It seems like values should be checked before any range checking, so users don't have to set ranges that won't actually be used in the long run.

[github-actions]

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