For more information including compatibility, examples and test cases, see https://github.com/petercrlane/r7rs-libs

0.1. Maths Integer Functions: (import (slib math-integer))

Using the functions in this library means that integer values will return integer results. Using non-integer values generates errors.

Further documentation: http://people.csail.mit.edu/jaffer/slib/Irrational-Integer-Functions.html#Irrational-Integer-Functions

For example: 

sash[r7rs]> (expt 2.1 3)
9.261000000000001
sash[r7rs]> (integer-expt 2.1 3)
Unhandled exception
  Condition components:
  1. &error
  2. &message integer-expt
  3. &irritants (2.1 3)
  4. &stack-trace
...
sash[r7rs]> (integer-expt 2 3)
8

Additionally, in cases where an inexact result might be expected, these functions will return the nearest integer equivalent:

For example: 

sash[r7rs]> (sqrt 9)
3
sash[r7rs]> (sqrt 10)
3.1622776601683795
sash[r7rs]> (integer-sqrt 9)
3
sash[r7rs]> (integer-sqrt 10)
3