## Document the precision and limits of sample_laplace_distribution()

The function documentation of sample_laplace_distribution() should answer the following questions:

- what is the range of outputs?
- what is the precision of the outputs?

add_laplace_noise() should document, and possible enforce:

- what is the maximum
`delta_f / epsilon`

value that can be used within the limits of double precision arithmetic?- to preserve differential privacy, the low bits have to be obscured by the noise. So this can be at most 2^53^.

- what is the minimum
`delta_f / epsilon`

value that can be used within the limits of double precision arithmetic?- (zero provides no differential privacy)

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