lib: use bracket notation instead of startsWith/endsWith for single char
#106254
| Job | Run time |
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| -1s | |
| -1s | |
| -7s | |
| -9s |
startsWith/endsWith for single char
#106254
| Job | Run time |
|---|---|
| -1s | |
| -1s | |
| -7s | |
| -9s |