Why Pade approximant order have been restricted?

[s-celles]

Hello,

it's not very important but I wonder why Pade approximant order have been restricted?

ControlSystems.jl/lib/ControlSystemsBase/src/delay_systems.jl

Lines 128 to 137 in 0d82540

	"""
	pade(τ::Real, N::Int)
	Compute the `N`th order Padé approximation of a time-delay of length `τ`.
	See also [`thiran`](@ref) for discretization of delays.
	"""
	function pade(τ::Real, N::Int)
	if !(1 <= N <= 10); error("Order of Padé approximation must be between 1 and 10. Got $N."); end

Any idea?

[baggepinnen]

Because we do not have the coefficients for higher orders defined. Higher-order transfer functions are also numerically ill-conditioned, so you're likely to encounter some issues if you try to go much higher