Does repr context officially allow multiple attributes?

[bvdmitri]

From the documentation of the repr it is not entirely clear if the context keyword argument accepts multiple attributes. E.g. it says:

The optional keyword argument context can be set to :key=>value pair or an IO or IOContext object whose
attributes are used for the I/O stream passed to show.

What if I want to set multiple :key=>value pairs? This apparently works:

julia> repr(1; context=(:a => 1, :b => 2))
"1"

But is it the official way or it works by accident? For example this doesn't work

julia> repr(MIME"text/plain"(), 1; context=(:a => 1, :b => 2))
ERROR: MethodError: no method matching IOContext(::IOBuffer, ::Tuple{Pair{Symbol, Int64}, Pair{Symbol, Int64}})
The type `IOContext` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  IOContext(::IO, ::Pair)
   @ Base show.jl:333
  IOContext(::IO, ::Pair, Pair...)
   @ Base show.jl:413
  IOContext(::IO, ::Base.ImmutableDict{Symbol, Any})
   @ Base show.jl:316
  ...

Stacktrace:

Would be nice to clarify the usage of multiple attributes in the documentation.

[JeffBezanson]

The docstring for sprint says this is officially supported, so we should make it work generally by adding a method to IOContext that accepts a tuple of pairs. Feel free to open a PR adding that if you like.