Clarify behavior of parse_url_opts with regards to case sensitivity
#613
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Which issue does this PR close?
Related to #529
Rationale for this change
Clarify the behavior of
parse_url_opts, while the variousfrom_env()functions do mention they only support case sensitivity, it does seem like multiple users have tried to useparse_url_optsand ended up with pretty confusing problems.What changes are included in this PR?
Small enhancement to docs
Are there any user-facing changes?
No