Bug: lapply() over a factor yields length-1 factor elements (integer
codes), while for() over a factor yields character strings. The job
list stored j\$group as a factor integer, but the reassembly loop
compared it with identical(j\$group, g) where g was character -- always
FALSE, so no simulation chunks were ever assembled and coverage stayed
NA throughout.
Fix: convert unique_groups to character before building jobs so both
the job list and the reassembly loop use the same type.
Tests: replaced na.rm = TRUE guards with explicit anyNA() checks so the
test suite would have caught the all-NA result immediately.
Also adds a sequential-mode performance hint (analogous to sir.R
lines 1116-1127) when simulations >= 500 and >= 3 regimens.
https://claude.ai/code/session_01FC43syPbzhGmKgrrVNHjnF
f5ea4ea4ba