Is the media attribute case sensitive or not?

Regarding media attribute of LINK elements, in Section 6.13, the HTML
4.0 spec says:

"A case-sensitive match is then made with the set of media types defined
above".

But in Section 14.2.3:
"Attribute definitions
...
media = media-descriptors [CI]"

Stating that the attribute is case in-sensitive. Which is it?

(A clue to the original intent may be that in the sentence "A
case-sensitive match..." the words "case-sensitive" are linked to the
definition of "case-insensitive"... the plot thickens.)