Avoid O(n^2) inserts when formatting enums - #346
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Replace repeated StringBuilder.Insert(0, ...) calls with a stack-allocated buffer of matched indices and a final forward Append pass. This collects matching enum value indices during the scan (using stackalloc Span<int>) and then builds the result string in forward order with StringBuilder.Append and separators, avoiding the O(n²) cost of inserting at the front repeatedly. Keeps logic readable and is more efficient for typical small enum sizes.
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Replace repeated StringBuilder.Insert(0, ...) calls with a stack-allocated buffer of matched indices and a final forward Append pass. This collects matching enum value indices during the scan (using stackalloc Span) and then builds the result string in forward order with StringBuilder.Append and separators, avoiding the O(n²) cost of inserting at the front repeatedly. Keeps logic readable and is more efficient for typical small enum sizes.