[julia-users] When can the broadcast dot (in 0.5) be used?

[Michael Borregaard]

I have a hard time figuring out what functions and types accept the 
broadcast dot in 0.5. E.g.,

is(1, 2)                # false
is.([1, 2], 2)          # Bool[false, true]

is("a", "b")            #false
is.("["a","b"], "b")    #MethodError: no method matching size(::String)

Can anyone give me a hint?