It looks like there was an addition to R-devel yesterday that is causing failures for data.table
r89198 | luke | 2025-12-18 20:25:15 +0000 (Thu, 18 Dec 2025) | 2 lines
Add bounds checking in STRING_ELT and VECTOR_ELT functions.
Mainly flagging for early awareness as blocked a submission of mine to CRAN this morning.