Using locale-sensitive methods on locale-sensitive data can produce unexpected results if when the no locale is specified unspecified . Programming language identifiers, protocol keys and HTML tags are often specified in a particular locale, usually Locale.ENGLISH. It may even be possible to bypass input filters by changing the default locale, which can alter the behavior of locale-sensitive methods. For example, when a string is converted to uppercase, it may be declared valid; however, changing the string back to lower case during subsequent execution may result in a black-listed string.
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