Each type has a corresponding predicate which defines the objects which are members of that type.
integerp
numberp
null
consp
listp
vectorp
subrp
functionp
sequencep
stringp
symbolp
posp
bufferp
windowp
markp
processp
filep
keymapp
eventp
commandp
The documentation for these functions is with the documentation for the relevant type.
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