Fix transpose_matvec for categorical matrix with read-only indices (replaces #489) #491
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This PR replaces #489.
The previous PR introduced a test case (1ffcc26) and an initial fix (14c7553), but @jtilly suggested a cleaner implementation (d608d50).
This PR applies @jtilly’s improved fix while keeping the test from the original PR. All tests now pass.
Checklist
CHANGELOG.rstentry