We actually don’t use BIP-0044 logical hierarchy for deterministic wallets.
Instead we opted for the HKDF RFC 5869. The reasoning is primarily motivated by the fact that the standard ed25519 signing scheme does not support public key derivation.
We have a basic prototype for SLIP-0010 and would encourage anyone interested in providing SLIP-0044 support to submit a pull request.
Child Key Derivation in Libra