method or class, version deprecated, version removal, notes
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get_imm, 2.2.0, 2.4.0, arg inputs only
next_imm, 2.2.0, 2.4.0, arg inputs only
BasePeriod, 2.2.0, 2.4.0, error on str input for Frequency.

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IndexFixedRateBond.rate(metric variants), 2.5.1, not yet removed.