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*implementation-dependent*.

`most-positive-fixnum`

is that *fixnum* closest in value
to positive infinity provided by the implementation,
and greater than or equal to both 2^15 - 1 and
`array-dimension-limit`

.

`most-negative-fixnum`

is that *fixnum* closest in value
to negative infinity provided by the implementation,
and less than or equal to -2^15.