collapse version 2.0.16

• Fixes an installation bug on some Linux systems (conflicting types) (#613).

• collapse now enforces string encoding in fmatch() / join(), which caused problems if strings being matched had different encodings (#566, #579, and #618). To avoid noticeable performance implications, checks are done heuristically, i.e., the first, middle and last string of a character vector are checked, and if not UTF8, the entire vector is coerced to UTF8 strings before the matching process. In general, character vectors in R can contain strings of different encodings, but this is not the case with most regular data. For performance reasons, collapse assumes that character vectors are uniform in terms of string encoding.

• Fixes a bug using qualified names for fast statistical functions inside across() (#621, thanks @alinacherkas).

• collapse now depends on R >= 3.4.0 due to the enforcement of STRICT_R_HEADERS = 1 from R v4.5.0. In particular R API functions were renamed Calloc -> R_Calloc and Free -> R_Free.