use_DRAC() ... output table interprets 'F' as logical 'FALSE' instead of character

[RLumSK]

Expected behaviour

DRAC allows specifying three different types of mineral phases, namely F, Q, and PM.
These values are required as character values. Consequently, the output table
after using use_DRAC() should also show a character.

Observed behaviour

The output after using DRAC interprets the F as logical value and returns FALSE.
However, I guess what is transferred to DRAC is really a F, and not a FALSE otherwise we should see an error message. Anyway, it should be corrected.

Running mini example

library(Luminescence)
input <- template_DRAC()
input$Mineral <- "F"
print(output$DRAC$input)