MAINT: Amend byte cache

[j-t-1]

Cache string to byte conversions when the string length is greater than one.

2726

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.14%. Comparing base (c96d01c) to head (e3136a6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2730 +/- ## ======================================= Coverage 95.14% 95.14% ======================================= Files 51 51 Lines 8547 8547 Branches 1703 1703 ======================================= Hits 8132 8132 Misses 261 261 Partials 154 154 ```

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[stefan6419846]

I am not sure if this really makes sense or what the original intent of the old implementation has been. Until this is more clear (see my comment in #2726), I recommend against merging this.

[j-t-1]

@pytest.mark.parametrize(
    ("input_str", "expected"),
    [
        ("foo", b"foo"),
        ("😀", "😀".encode()),
        ("‰", "‰".encode()),
        ("▷", "▷".encode()),
        ("世", "世".encode()),
        # A multi-character string example with non-latin-1 characters:
        ("😀😃", "😀😃".encode()),
    ],
)
def test_b(input_str: str, expected: str):
    assert pypdf._utils.b_(input_str) == expected

Should this be:

def test_b(input_str: str, expected: bytes):
    assert pypdf._utils.b_(input_str) == expected

[stefan6419846]

Isn't your new code the same? If you are referring to the decorator - no, this cannot be removed. This defines the parameters/sub-tests to use for the test.

[j-t-1]

My comment could have been better. The change is to the type of the second argument from str to bytes (keeping the decorator).

[stefan6419846]

Yes, the expected parameter should be bytes, as we are encoding the strings here.

[j-t-1]

The caching of the existing function is maybe deliberate.