repl-read (clj)

Default :read hook for repl. Reads from *in* which must either be an instance of LineNumberingPushbackReader or duplicate its behavior of both supporting .unread and collapsing all of CR, LF, and CRLF into a single \newline. repl-read: - skips whitespace, then - returns request-prompt on start of line, or - returns request-exit on end of stream, or - reads an object from the input stream, then - skips the next input character if it's end of line, then - returns the object.