Convert more of the StringUtils API to take CharSequence
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Key: LANG-687
URL: https://issues.apache.org/jira/browse/LANG-687
Project: Commons Lang
Issue Type: Improvement
Components: lang.*
Reporter: Henri Yandell
Fix For: 3.0
Wherever possible, use CharSequence and not String in the StringUtils API.
substring can go to subSequence inside code. The general substring method can
be replaced with a subSequence method and substring deprecated(?). One question
is whether to implement a CharSequence.indexOf type method. Given that it's
merely a walking method(?!?), this might be quite handy and would allow a bunch
of StringUtils methods to move over.
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