Github user MarkDacek commented on the issue:
https://github.com/apache/commons-lang/pull/251
@chtompki Please look this over. We have some interesting conflicts here.
1. The issue mentioned above. indexOf("a") will double-count
surrogate-pairs if they exist. We can fix this if need be.
2. A string with two surrogate-pairs will read as length 4, though we will
treat it as length 2 for the purpose of these operations. E.G. :
```
final int CODE_POINT = 0x2070E;
StringBuilder builder = new StringBuilder();
builder.appendCodePoint(CODE_POINT);
builder.appendCodePoint(CODE_POINT);
StringUtils.lastIndexOf(builder, CODE_POINT, 2)
```
the bottom line will return -1, wheras the builder.toString()... version
returns 2. I suspect this is just that they disregarded our issue and start at
charAt(2) instead of our iterative approach here.
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