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1eac4d2c07
Remove `tx_history` and `ledger_header` methods from API version 2. Update `RPC::Handler` to allow for methods (or method implementations) to be API version specific. This partially resolves #4727. We can now store multiple handlers with the same name, as long as they belong to different (non-overlapping) API versions. This necessarily impacts the handler lookup algorithm and its complexity; however, there is no performance loss on x86_64 architecture, and only minimal performance loss on arm64 (around 10ns). This design change gives us extra flexibility evolving the API in the future, including other parts of #4727. In API version 2, `tx_history` and `ledger_header` are no longer recognised; if they are called, `rippled` will return error `unknownCmd` Resolve #3638 Resolve #3539