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Add ComparisonForm for per-ecosystem package identity - #50
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Parse canonicalises only what packageurl-go does, so spellings such as pkg:pypi/zope.interface and pkg:pypi/zope_interface, or mixed-case NuGet ids, still compare unequal. ComparisonForm applies the remaining ecosystem rules (PEP 503, NuGet case, Composer's leading v, conda channel, OCI repository paths, Swift registry identity case) without changing what Parse or String return.
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Adds
PURL.ComparisonForm(), which returns a copy of a PURL in a form where two spellings of the same package compare equal:zope.interface,zope_interfaceandZope-Interfacematchvchannelqualifier, whether it was written as namespace or aschannel/nameParseandStringare unchanged, so nothing that stores PURL strings is affected. These rules currently live in git-pkgs/proxy (git-pkgs/proxy#563), which will switch to this once it is released.