pushnew with multiple occurrences of the same keyword argument is parsed incorrectly.

[robert-strandh]

A form such as (pushnew x y :key a :key b) is parsed incorrectly. First of all, it is the second
:key that retained. But it should probably preserve all the arguments, no? It also rejects
an argument list such as (pushnew x y :key a :hello b :allow-other-keys t) but this is
perfectly valid syntax.

[robert-strandh]

Same issue with print-unreadable-object.

[robert-strandh]

Same issue with pprint-logical-block.