Symbolics coefficients

General Usage
1

What is happening? How do I get 4 out of this?

using Symbolics
@variables a b
julia> Symbolics.coeff(4a*b).dict
Dict{Any, Any} with 2 entries:
  a => 1
  b => 1
2

How about

julia> polynomial_coeffs(4a*b, [a, b])
(Dict{Any, Any}(a*b => 4), 0)
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