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We already have some primops for determining the type of a value, such as isString, but they're incomplete: for instance, there is no isPath. Rather than adding more isBla functions, the generic typeOf function returns a string representing the type of the argument (e.g. "int").
Nix is a purely functional package manager. For installation and usage instructions, please read the manual, which can be found in `docs/manual/manual.html', and additionally at the Nix website at <http://nixos.org/>. Acknowledgments This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.OpenSSL.org/).