[BUG REPORT] [biblatex] numeric-comp style limited to compress 9 citations

[Vilde Rieker]

I was trying to generate a compressed inline citation of multiple
references. In my preamble I've got:

\usepackage[backend    = biber,
                sorting    = none,
                sortcites  = false,
                giveninits = false,
                doi        = true,
                isbn       = false,
                url        = true,
                style      = numeric-comp,
                ]{biblatex}

When citing multiple citations, they appear like this:

*[64, 73–80, 65–72]*

instead of the more obvious compression for a continuous range:

*[64–80]*

However, by splitting up the inline citation at different places, I found
that the "compression limit" appears to be at 9 references. Two separate
inline citations of the same range gave:

*[64–72] [73–80]*

and as soon as I added one more citation to the first of these two ranges,
it yielded a similar random output like before.

It should also be noted that I am citing references that has not been cited
earlier in the document, so they have not already been assigned an order. I
have tested with several (previously unused) references, and it is obvious
that this only occurs once the number of citations exceed 9, so to me it
really seems like a bug.

I have not found anyone who has encountered this issue in the online
forums, but if there is a known workaround I would be very interested to
know.

Best regards,

Vilde
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