Reuse parameter index for all case permutations #5432
Merged
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Fixes #5428
Given we bind before we write, and reset all the bind info after writing we can't have multiple param indices pointing to the same parameter instance.
This is already guarded against for positional via the NpgsqlParameterCollection ownership check (can't add the same instance twice as it's already part of a collection). While for multiple same cased name references we already folded those to the same index.