copy-pprint-dispatch
{&optional table} => new-table
table---a pprint dispatch table, or nil.
new-table---a fresh pprint dispatch table.
Creates and returns a copy of the specified table, or of the value of *print-pprint-dispatch* if no table is specified, or of the initial value of *print-pprint-dispatch* if nil is specified.
Should signal an error of type type-error if table is not a pprint dispatch table.
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