Hash newtypes that only hash one type of data should have a From impl #1909
Description
For example, all these:
/// A hash of a public key.
pub struct PubkeyHash(hash160::Hash);
/// A hash of Bitcoin Script bytecode.
pub struct ScriptHash(hash160::Hash);
/// SegWit version of a public key hash.
pub struct WPubkeyHash(hash160::Hash);
/// SegWit version of a Bitcoin Script bytecode hash.
pub struct WScriptHash(sha256::Hash);should have implementations using From for the types they are supposed to has. So you can use pk.into() to provide a WPubkeyHash, f.e..