Accept Number orders in calculus operators

[jishnub]

This would help with constant propagation in certain cases, using static integers as orders. Currently, StaticInts are not Integers, although SciML/Static.jl#92 would mean that this change in unnecessary, in which case this may be reverted.

julia> @code_typed rangespace(Derivative(Chebyshev(), 1))
CodeInfo(
1 ─ %1 = Base.getfield(D, :order)::Int64
│   %2 = (%1 === 0)::Bool
│   %3 = Base.not_int(%2)::Bool
└──      goto #3 if not %3
2 ─ %5 = %new(Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}, %1, $(QuoteNode(-1.0..1.0 (Chebyshev))))::Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}
└──      goto #4
3 ─ %7 = %new(Core.AssertionError, "m ≠ 0")::AssertionError
│        Base.throw(%7)::Union{}
└──      unreachable
4 ─      goto #5
5 ─      return %5
) => Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}

julia> using Static

julia> @code_typed rangespace(Derivative(Chebyshev(), StaticInt(1)))
CodeInfo(
1 ─     return $(QuoteNode(Ultraspherical(static(1))))
) => Ultraspherical{StaticInt{1}, ChebyshevInterval{Float64}, Float64}

Another example:

julia> @code_typed ApproxFunBase.promoterangespace(Derivative(Chebyshev(), 1), Ultraspherical(1, ChebyshevInterval()))
CodeInfo(
1 ─ %1  = Base.getfield(P, :order)::Int64
│   %2  = (%1 === 0)::Bool
│   %3  = Base.not_int(%2)::Bool
└──       goto #3 if not %3
2 ─ %5  = %new(Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}, %1, $(QuoteNode(-1.0..1.0 (Chebyshev))))::Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}
└──       goto #4
3 ─ %7  = %new(Core.AssertionError, "m ≠ 0")::AssertionError
│         Base.throw(%7)::Union{}
└──       unreachable
4 ─       goto #5
5 ─       goto #6
6 ─ %12 = invoke ApproxFunBase.promoterangespace(P::ApproxFunBase.ConcreteDerivative{Chebyshev{ChebyshevInterval{Float64}, Float64}, Int64, Float64}, sp::Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64}, %5::Ultraspherical{Int64, ChebyshevInterval{Float64}, Float64})::Union{ApproxFunBase.ConcreteDerivative{Chebyshev{ChebyshevInterval{Float64}, Float64}, Int64, Float64}, TimesOperator{Float64, _A, _B, Operator{Float64}} where {_A, _B}}
└──       return %12
) => Union{ApproxFunBase.ConcreteDerivative{Chebyshev{ChebyshevInterval{Float64}, Float64}, Int64, Float64}, TimesOperator{Float64, _A, _B, Operator{Float64}} where {_A, _B}}

julia> @code_typed ApproxFunBase.promoterangespace(Derivative(Chebyshev(), StaticInt(1)), Ultraspherical(StaticInt(1), ChebyshevInterval()))
CodeInfo(
1 ─     return $(QuoteNode(ConcreteDerivative : Chebyshev() → Ultraspherical(static(1))))
) => ApproxFunBase.ConcreteDerivative{Chebyshev{ChebyshevInterval{Float64}, Float64}, StaticInt{1}, Float64}

[codecov]

Codecov Report

Base: 68.59% // Head: 68.65% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (bd1df9b) compared to base (50185a5).
Patch coverage: 76.92% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
+ Coverage   68.59%   68.65%   +0.06%     
==========================================
  Files          28       28              
  Lines        2458     2466       +8     
==========================================
+ Hits         1686     1693       +7     
- Misses        772      773       +1     

Impacted Files	Coverage Δ
src/Spaces/Hermite/Hermite.jl	70.51% <0.00%> (-0.92%)	⬇️
src/Spaces/Chebyshev/ChebyshevOperators.jl	86.23% <100.00%> (+0.20%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	77.69% <100.00%> (+0.17%)	⬆️
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	79.77% <100.00%> (+0.34%)	⬆️

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