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USING THE PLUGIN INTERFACE. ISSUE: No support for floating-point plugin system variables. SOLUTION: Allowing plugins to define and expose floating-point system variables of type double. MYSQL_SYSVAR_DOUBLE and MYSQL_THDVAR_DOUBLE are added. ISSUE: Fractional part of the def, min, max values of system variables are ignored. SOLUTION: Adding functions that are used to store the raw representation of a double in the raw bits of unsigned longlong in a way that the binary representation remains the same.