postbag 0.4.3

Postbag is a high-performance serde codec for Rust that provides efficient data encoding with configurable levels of forward and backward compatibility.
Documentation 
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//! Configuration of Postbag serialization data format.

use std::fmt;

/// Configuration trait.
pub trait Cfg {
    /// Whether struct field identifiers and enum variant identifiers
    /// are serialized.
    fn with_idents() -> bool;
}

/// Static (compile-time) configuration.
#[derive(Clone, Copy)]
pub struct StaticCfg<const WITH_IDENTS: bool>;

impl<const WITH_IDENTS: bool> fmt::Debug for StaticCfg<WITH_IDENTS> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("StaticCfg").field("with_idents", &WITH_IDENTS).finish()
    }
}

impl<const WITH_IDENTS: bool> Cfg for StaticCfg<WITH_IDENTS> {
    fn with_idents() -> bool {
        WITH_IDENTS
    }
}

/// Serialize with identifiers.
///
/// Struct field identifiers and enum variant identifiers are serialized
/// as strings or using numerical identifier encoding.
pub type Full = StaticCfg<true>;

/// Serialize without identifiers.
///
/// Struct field identifiers are not serialized.
/// Enum variants are serialized using their index.
pub type Slim = StaticCfg<false>;