tsvd type instability

[mileslucas]

Hello all, I was doing some type-inference testing on my package code and concluded the instability is from calling tsvd. A minimal working example below shows the method is failing to infer the dimension of the output-

julia> using TSVD

julia> X = randn(10, 301*301);

julia> @code_warntype tsvd(X, 5)
Variables
  #self#::Core.Compiler.Const(TSVD.tsvd, false)
  A::Array{Float64,2}
  nvals::Int64
  maxiter::Int64
  initvec::Array{Float64,1}
  tolconv::Float64
  tolreorth::Float64
  stepsize::Int64
  debug::Bool

Body::Tuple{Vararg{AbstractArray{Float64,N} where N,N} where N}
1 ─       (maxiter = 1000)
│   %2  = TSVD.eltype(A)::Core.Compiler.Const(Float64, false)
│   %3  = TSVD.float(%2)::Core.Compiler.Const(Float64, false)
│   %4  = Core.apply_type(TSVD.Vector, %3)::Core.Compiler.Const(Array{Float64,1}, false)
│   %5  = TSVD.size(A, 1)::Int64
│   %6  = TSVD.randn(%5)::Array{Float64,1}
│         (initvec = TSVD.convert(%4, %6))
│   %8  = TSVD.eltype(initvec)::Core.Compiler.Const(Float64, false)
│   %9  = TSVD.real(%8)::Core.Compiler.Const(Float64, false)
│   %10 = TSVD.eps(%9)::Core.Compiler.Const(2.220446049250313e-16, false)
│         (tolconv = TSVD.sqrt(%10))
│   %12 = TSVD.eltype(initvec)::Core.Compiler.Const(Float64, false)
│   %13 = TSVD.real(%12)::Core.Compiler.Const(Float64, false)
│   %14 = TSVD.eps(%13)::Core.Compiler.Const(2.220446049250313e-16, false)
│         (tolreorth = TSVD.sqrt(%14))
│   %16 = TSVD.div(nvals, 10)::Int64
│         (stepsize = TSVD.max(1, %16))
│         (debug = false)
│   %19 = TSVD.:(var"#tsvd#7")(maxiter::Core.Compiler.Const(1000, false), initvec, tolconv, tolreorth, stepsize, debug::Core.Compiler.Const(false, false), #self#, A, nvals)::Tuple{Vararg{AbstractArray{Float64,N} where N,N} where N}
└──       return %19

emphasis %19 = ...::Tuple{Vararg{AbstractArray{Float64,N} where N,N} where N}