is there a function or keyboard shortcut to list all functions operating on 
certain datatype?

for example, in a typical object-based approach, you can type the object in 
REPL with a dot and it completes all methods operating on that object. in 
Julia, we can only list all the behavior of a certain function like 
methods(+) but in most cases, you are more interested not on the function + 
itself but on the list of functions operating on a given datatype. in many 
cases, you forgot all the names of the functions but you know it operates 
on a certain object only so it's easy to recall it if you can list the 
names of these functions operating on a certain object only. currently, if 
you do methods(+), you will endless list. it will be nice if you can do 

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