Include subfield k from 245 in title index (important for manuscripts/archives)
Subfield k of the 245 title field should always be indexed. Currently, it is only indexed when subfield a is absent. OCLC makes clear that both subfields may be used together: "Use subfield ǂk also to indicate "form" even if a formal title is given in subfields ǂa, ǂb, and ǂc." From: https://www.oclc.org/bibformats/en/2xx/245.html
This subfield is important for manuscripts and archives. Examples from OCLC:
245 ǂa Four years at Yale : ǂk diaries, ǂf 1903 September 16-1907 October 5
245 ǂa The charity ball : ǂb a comedy in four acts : ǂk typescript, ǂf 1889 / ǂc by David Belasco and Henry C. DeMille
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Temmo Korisheli
commented
Indexing shouldn't ignore valid subfields!