I, of course, had to immediately go to build 63 of TC21. Because this is the latest version, I cannot see the fix list for the various builds. I did notice the following problem with the above mentioned numeric functions: @int appears to do nothing and all three r seem to ignore a comma separator.
C:\bin>echo %@ceiling[12.34] %@floor[12.34] %@int[12.34]
1234 1234 12.34
C:\bin>echo %@ceiling[12,34] %@floor[12,34] %@int[12,34]
1234 1234 1234
C:\bin>echo %@ceiling[12.34] %@floor[12.34] %@int[12.34]
1234 1234 12.34
C:\bin>echo %@ceiling[12,34] %@floor[12,34] %@int[12,34]
1234 1234 1234