Provide a StrBuilder-based or StringBuilder-based ToStringBuilder
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                 Key: LANG-779
                 URL: https://issues.apache.org/jira/browse/LANG-779
             Project: Commons Lang
          Issue Type: Improvement
          Components: lang.builder.*
    Affects Versions: 3.1
            Reporter: Simon Dierl
            Priority: Minor


At the moment, ToStringBuilder internally uses a StringBuffer to create the 
output String. StringBuffer, as opposed to StringBuilder and StrBuilder, is 
synchronized. Since ToStringBuilder will almost never leave the 
toString()-method, the synchronization only adds overhead.

Since the ToStringBuilder API never suggests that ToStringBuilder is 
thread-safe, either the current implementation could be changed to use 
Str[ing]Builder or an alternative implementation could be provided.

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