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Prior to cluster mempool, a policy was in place that disallowed non-TRUC transactions from being TX_RECONSIDERABLE in a package setting if it was below minrelay. This was meant to simplify reasoning about mempool trimming requirements with non-trivial transaction topologies in the mempool. This is no longer a concern post-cluster mempool, so this is relaxed. In effect, this makes 0-value parent transactions relayable through the network without the TRUC restrictions and thus the anti-pinning protections.
Transaction Relay Policy
Policy (Mempool or Transaction Relay Policy) is the node's set of validation rules, in addition
to consensus, enforced for unconfirmed transactions before submitting them to the mempool. These
rules are local to the node and configurable, see "Node relay options" when running -help.
Policy may include restrictions on the transaction itself, the transaction
in relation to the current chain tip, and the transaction in relation to the node's mempool
contents. Policy is not applied to transactions in blocks.
This documentation is not an exhaustive list of all policy rules.