The docstring says:
"...This is a list with 6 entries....
pre Chars allowed as prematch. Beginning of line will be
allowed too.
post Chars allowed as postmatch. End of line will be allowed too.
border The chars *forbidden* as border characters.
body-regexp A regexp like "." to match a body character. Don't use
non-shy groups here, and don't allow newline here.
newline The maximum number of newlines allowed in an emphasis exp.
..."
That looks like 5 entries to me.
best,
r
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