//! The shared encoder effort preset, used by both WebP codecs.
/// How hard an encoder searches for a smaller result.
///
/// Higher effort spends more time to produce a smaller (and, for lossy, closer to
/// the source) file; the output is deterministic per effort. The lossless (VP8L)
/// and lossy (VP8) encoders share these three tiers — see each codec's `encode`
/// entry point for exactly what a tier turns on.
///
/// A closed, stable set (the well-established Fast / Balanced / Best trichotomy),
/// so this is deliberately *not* `#[non_exhaustive]`: both codecs match it
/// exhaustively.