rbindlist internal error when binding integer64 + character columns

[MichaelChirico]

rbindlist(list(
  data.table(bit64::as.integer64(1)),
  data.table("1")
))
Error in rbindlist(list(data.table(bit64::as.integer64(1)), data.table("1"))) : 
  Internal error: column 1 of result is determined to be integer64 but maxType=='character' != REALSXP

[ben-schwen]

This seems like a duplicate to #3911 which should already be addressed by #5446 but I don't have a laptop with me to check.

[MichaelChirico]

the solution may be the same but that's not throwing an internal error, so leaving this open for now (feel free to mark as closed by the PR, I also can't check at the moment)