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Real-only versions of transcedental procedures (warning: these procedures are not compiled directly into the corresponding C library procedures, but a combination of internal SCM procedures, guaranteeing exact correspondence with the SCM interpreter while hindering the speed):

real-sqrt real-exp real-ln real-expt real-sin real-cos real-tan real-asin real-acos real-atan real-sinh real-cosh real-tanh real-asinh real-acosh real-atanh

*Note Bene:* These procedures are compiled to faster code than the
corresponding generic versions `sqrt`, `abs`, … `expt`.

A selection of other extra primitives in SCM is also recognized as
primitives. eg. `get-internal-run-time`, `quit`, `abort`,
`restart`, `chdir`, `delete-file`, `rename-file`.