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8.7 Shell-friendly syntax for configuration

When considering environment variable CL_SOURCE_REGISTRY ASDF will skip to next configuration if it’s an empty string. It will READ the string as a SEXP in the DSL if it begins with a paren (, otherwise it will be interpreted much like TEXINPUTS, as a list of paths, where

* paths are separated by a : (colon) on Unix platforms (including cygwin), by a ; (semicolon) on other platforms (mainly, Windows).

* each entry is a directory to add to the search path.

* if the entry ends with a double slash // then it instead indicates a tree in the subdirectories of which to recurse.

* if the entry is the empty string (which may only appear once), then it indicates that the inherited configuration should be spliced there.