Getting function signature expression from method instance

General Usage
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1

Is there an existing function to get a method definition expression from the Method instance?

As example, I would like to have some function signature_expression such that:

ff(a::T, b::C, c::Tuple{Real,Real}) where {T <: Real,C} = "DO SOMETHING"
mtd = methods(ff)[1]
signature_expression(mtd) == :(ff(a::T, b::C, c::Tuple{Real,Real}) where {T <: Real,C})