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#### 16.3.2 Types

Generally, marshalling between Lisp and C data types is done using SBCL's FFI. See Foreign Function Interface.

Some functions accept objects such as filenames or file descriptors. In the C binding to POSIX these are represented as strings and small integers respectively. For the Lisp programmer's convenience we introduce designators such that CL pathnames or open streams can be passed to these functions. For example, `rename` accepts both pathnames and strings as its arguments.