Crate kstring

Key String: Optimized for map keys.

Background

Considerations:

• Large maps
• Most keys live and drop without being used in any other way
• Most keys are relatively small (single to double digit bytes)
• Keys are immutable
• Allow zero-cost abstractions between structs and maps (e.g. no allocating when dealing with struct field names)

Ramifications:

• Inline small strings rather than going to the heap.
• Preserve &'static str across strings (KString), references (KStringRef), and lifetime abstractions (KStringCow) to avoid allocating for struct field names.
• Use Box<str> rather than String to use less memory.

Feature Flags

• arc — O(1) clone support

• max_inline — Inline (stack) strings use the full width of KStrings

• unsafe (enabled by default) — Allow unsafe code

• serde (enabled by default) — serde compatibility