Is the coding used by Genetic Algorithm Toolbox 'ga' with Population type 'doubleVector' real coding (real valued) or binary coding? In case it is binary coded, which is the codification method?

Hello, I'd like to know if when using Optimization Toolbox 'ga' and 'gaoptimset' with Population Type 'doubleVector', which is the default option, if the type of encoding is real coding (real-valued coding) or if it is binary coding. In the case it is binary coding, what is the precision? And which is the method of codification? I'm using also 'MutationFcn' '@mutationadaptfeasible' and 'CrossoverFcn' '@crossoverscattered'. Thanks and Best Regards