`PRINT` allows all types.

[python-processing-unit]

According to the specification section 9.1.12:

• BOOL: PRINT(~STR: arg1, ..., ~STR: argN) = MUST convert each argument to STR, concatenate the rendered arguments, append a trailing newline, write the result to the console output, record the corresponding I/O event in the execution log, and return FALSE.

The implementation, however, allows any type as PRINT args, not only those that can coerce to STR.