You can use functions in I-descriptors (via the SUBR function only) because the
mechanism that reserves the first position on the stack for functions is
exactly the same mechanism used by the SUBR() function.
You can not use custom functions directly as functions in I-descriptors because
you have no mechanism for declaring that the name of the function is a function
name (that is, a DEFFUN declaration) in the query engine.
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