BoundsError -> NaN ? (in Interpolations)

General Usage
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2

This is documented here, i.e.,

ip = linear_interpolation(xax_in, v_in; extrapolation_bc = NaN)

You may also want to check the section on Extrapolation.

PS: For vectors, arrays or dictionaries you can just use get which takes a default argument for out-of-bound keys:

julia> A = reshape(1:6, 2, 3);

julia> get(A, (1, 2), NaN)
3

julia> get(A, (4, 2), NaN)
NaN
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