The point of the hypot function is to avoid underflow and overflow, however the implementation of the vararg method introduced with PR #25571 defeats this purpose:

julia> hypot(1e200, 0, 0)
Inf

julia> hypot(1e-300, 0, 0)
0.0

Instead in Julia 0.6 it gives the correct result:

ulia> hypot(1e200, 0, 0)
1.0e200

julia> hypot(1e-300, 0, 0)
1.0e-300

Edit: I've just seen this was already pointed out in #25571 (comment)