doc: /* Detect coding system of the text in the region between START and END.
Return a list of possible coding systems ordered by priority.
-If only ASCII characters are found, it returns a list of single element
+If only ASCII characters are found (except for such ISO-2022 control
+characters ISO-2022 as ESC), it returns a list of single element
`undecided' or its subsidiary coding system according to a detected
end-of-line format.
doc: /* Detect coding system of the text in STRING.
Return a list of possible coding systems ordered by priority.
-If only ASCII characters are found, it returns a list of single element
+If only ASCII characters are found (except for such ISO-2022 control
+characters ISO-2022 as ESC), it returns a list of single element
`undecided' or its subsidiary coding system according to a detected
end-of-line format.