would be very glad if there be some guy giving some suggestions. *performance improvement prs:* [lang-1548] split CharSequenceUtils.regionMatches() to two functions to improve 25% performances. also want to split related functons in StringUtils, but stucked here. [lang-1549] cleanroom implement CharSequenceUtils .lastIndexOf. I do think the performance will increase in general, but it highly depends on use data. So I have no idea how to do the perform test. As I also want to implement indexOf using same way, I need some help to make sure the current version of the function can work.
*some other boring prs:* [email-192] [lang-1547]
