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Currently the transient-prefix class is being used for all prefix
commands and there is only a single generic function that can be
specialized based on the class of a prefix command.
This generic function is called while setting up the transient and
is responsible for initializing the history slot. This is the
transient-wide history; many individual infixes also have a history
of their own.
The default (and currently only) method extracts the value from the
global variable transient-history.
A transient prefix command’s object is stored in the transient--prefix
property of the command symbol. While a transient is active, a clone
of that object is stored in the variable transient--prefix. A clone
is used because some changes that are made to the active transient’s
object should not affect later invocations.