make rationalize default to use Int on Irrational (and Real) (#46656)

Co-authored-by: Lilith Orion Hafner <lilithhafner@gmail.com>

Author: MasonProtter

base/rational.jl

@@ -245,7 +245,7 @@ function rationalize(::Type{T}, x::Union{AbstractFloat, Rational}, tol::Real) wh
     end
 end
 rationalize(::Type{T}, x::AbstractFloat; tol::Real = eps(x)) where {T<:Integer} = rationalize(T, x, tol)
-rationalize(x::AbstractFloat; kvs...) = rationalize(Int, x; kvs...)
+rationalize(x::Real; kvs...) = rationalize(Int, x; kvs...)
 rationalize(::Type{T}, x::Complex; kvs...) where {T<:Integer} = Complex(rationalize(T, x.re; kvs...), rationalize(T, x.im; kvs...))
 rationalize(x::Complex; kvs...) = Complex(rationalize(Int, x.re; kvs...), rationalize(Int, x.im; kvs...))
 rationalize(::Type{T}, x::Rational; tol::Real = 0) where {T<:Integer} = rationalize(T, x, tol)

test/rational.jl

@@ -542,6 +542,7 @@ end
              100798//32085
              103993//33102
              312689//99532 ]
+    @test rationalize(pi) === rationalize(BigFloat(pi))
 end
 
 @testset "issue #12536" begin