- signAndSendTransaction signed String(Uint8Array) ("1,2,3,..."), so
every dapp transaction got an invalid signature. Adapters gain
signBytes(), which signs the exact message bytes.
- v0 (VersionedTransaction) messages were parsed with the version byte
as the header; the shared parser handles legacy and v0.
- window.solana.signTransaction went through signMessage and its
"moves no SOL" overlay. It now has its own handler and overlay, and
signMessage refuses bytes that parse as a transaction (Phantom's rule),
since such a signature is a valid transaction signature.
- Overlays decode System transfers and SPL transfer / approve /
set-authority, and list everything else as not decoded.
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