LF or CRLF line ending?

I'm new to the Sigil ePUB editor and tried it out today (v2.8.1 on Windows), and noticed that when saving, in was converting the line endings from LF to CRLF.

Is this the norm for this application?

Is it not supposed to be using only LF (Unix style) for proper EPUB conformity?

I did run a search on the forum first with the keywords “CRLF” and “CRLF ending” and “LF ending” but did not seem to find any relevant posts about the issue.