Percentages allow non-integer types

[vojone]

I noticed, that rules like:

rule bad_type_percentage {
        strings:
                $s = "test"
        condition:
                "test"% of them
}

Result in error:

error: rule "bad_type_percentage" in test.yar(5): wrong type "string" for % operator

But when I execute this python code:

import yaramod

y = yaramod.Yaramod()
yara_file = y.parse_string(r'''
rule bad_type_percentage {
        strings:
                $s = "test"
        condition:
                "test"% of them
}
''')

print(yara_file.text)

No exception is raised by yaramod. Shouldn't yaramod also test the data type of the expression before the percentage (%) operator?