If EOL-TYPE is nil, the returned coding system detects
how end-of-line is formatted automatically while decoding.
-EOL-TYPE can be specified by an integer `unix', `dos' or `mac'.
+EOL-TYPE can be specified by an symbol `unix', `dos' or `mac'.
They means `lf', `crlf', and `cr' respectively."
(if (symbolp eol-type)
(setq eol-type (cond ((or (eq eol-type 'unix)