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    Type:Improvement 
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    Resolution: Unresolved
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    Priority:Minor - P4 
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        Query Execution
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SERVER-51556 and SERVER-51557 implemented $substrBytes and $substrCP expressions in SBE. (As of 7/11/24, have not been merged to master because master is frozen leading up to the 8.0 release). In SERVER-51557, mongo::substr_utils was introduced to cover similar behavior for $substrCP's classic and SBE implementation. A similar refactor can be performed for $substrBytes.