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### What it does
Checks for string methods that receive a single-character
`str` as an argument, e.g., `_.split("x")`.
### Why is this bad?
Performing these methods using a `char` is faster than
using a `str`.
### Known problems
Does not catch multi-byte unicode characters.
### Example
```
_.split("x");
```
Use instead:
```
_.split('x');
```
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