[pypy-issue] Issue #2998: str.maketrans wrongly complains about length of unicode arguments (pypy/pypy)

[Taha Jahangir]

New issue 2998: str.maketrans wrongly complains about length of unicode arguments
https://bitbucket.org/pypy/pypy/issues/2998/strmaketrans-wrongly-complains-about

Taha Jahangir:

This code works correctly in `7.0.0-alpha0`, but raises an error in  `7.1.0-beta0`.
```
trans = str.maketrans('0123456789', '۰۱۲۳۴۵۶۷۸۹')

ValueError: the first two maketrans arguments must have equal length
```

Buggy Environment:
```Python 3.6.1 (de061d87e39c7df4e436974096d7982c676a859d, Apr 01 2019, 15:02:06)
[PyPy 7.1.0-beta0 with GCC 8.2.1 20181127]
t```

Working Environment:
```Python 3.6.1 (dab365a46514, Feb 05 2019, 16:36:40)
[PyPy 7.0.0-alpha0 with GCC 6.2.0 20160901]
```