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Support for unbound parameters #2585

@MoAly98

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@MoAly98

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The MINUIT minimiser allows for unbound parameters, and the MINUIT guide even encourages the use of unbound parameters to avoid the non-linear, expensive parameter transformations done internally. Currently pyhf does not allow unbound parameters, but it shouldn't be difficult to support this by allowing users to pass a None or one sided parameters with (x, None) or (None, x) tuples.

This is related to the discussion in #2584.

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