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MultiDict
andHeaders
implement|
and|=
. Similar to thedict
implementation,|
only works with other mappings, and|=
works with mappings or iterators.UpdateDictMixin
implements|=
for updates.ImmutableDictMixin
andImmutableHeadersMixin
disallow|=
.EnvironHeaders
disallows|
as well to match itscopy
.closes #2977