fix: avoid in-place modification of groups in rebinning #1047
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This PR fixes a bug where the input 'groups' list for rebinning was modified in-place, causing errors when reused. Now, a new list is created using
[1, *groups]to handle underflow bins, preventing mutation of user input. This resolves issues with consecutive rebin operations and improves API safety. Closes #1046. Description and test generated by Copilot.