PERFORMANCE: ICU4N.Impl.RuleCharacterIterator: Fixed bottleneck when calling Lookahead() method #52
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…ethod to return ReadOnlySpan<char> instead of string to remove Substring() bottleneck
…() where ReadOnlySpan<T> is not supported by passing in the underlying buffer and recalculating the offset
…tead of the heap and to use the built-in precision specifier to pad the string
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The
Substring()method in .NET performs horribly compared to Java. So, theLookahead()method was modified to returnReadOnlySpan<char>so it can be sliced without allocating substrings.On .NET Framework 4.0, we work around this by passing in the buffer instead of calling
Lookahead().