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o rdkit gains a RDKit::common_properties namespace that contains common string value properties o Dict.h and below gain getPropIfPresent that attempts to retrieve a property and returns true/false on success or failure. This is used to optimize access. o rdkit learns how to pass property keys by reference, not value. A new namespace has been added to RDKit, common_properties that contains the std::string values for commonly used properties. This helps to avoid typos in string values but also avoids a creation of std::strings from character values. All accessors (has/get/clear and getPropIfPresent) now pass the key by reference. Additionally, getPropIfPresent removes the double lookup of hasProp/getProp which can be a significant speedup in the smiles and smarts parsers (10-20%)