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[Hotfix] pin numpy<2 #720

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[Hotfix] pin numpy<2 #720

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sjoerd-bouma
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See #695 for discussion

Currently, .nur files generated with numpy 2.* cannot be read in using earlier versions of numpy. This means we cannot guarantee compatibility even between two instances of the same version of NuRadioMC. This PR avoids this issue by pinning numpy<2; in order to switch to numpy 2.*, we will probably have to switch to numpy>=2 in some future release of NuRadioMC in order to maintain cross-compatibility for a fixed NuRadioMC versions.

(This is a proposed hotfix release v2.2.2; if accepted, this should also be merged into develop afterwards)

@fschlueter
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Can we start converting numpy arrays to lists ?

@fschlueter
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@sjoerd-bouma the notes from Uppsala say that you wanted to have a look if it is feasable to convert numpy arrays before serialization. Do you think you get around this any time soon?

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@sjoerd-bouma the notes from Uppsala say that you wanted to have a look if it is feasable to convert numpy arrays before serialization. Do you think you get around this any time soon?

Probably not before November - if you want to have a look yourself before then feel free.

@fschlueter
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November is fine with me

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