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## 4.5.0

**`(feat):`** Support omitting username or password from basic auth when configured via
`usernameOmit`/`passwordOmit` in the IR. When a field is omitted, it is
removed from the SDK's public API (`credentials()` takes fewer arguments)
and an empty string is used internally for the auth header encoding. When
both fields are omitted, the `credentials()` call and Authorization header
are skipped entirely.