Enum Kind 

pub enum Kind {
    F32,
    Color,
    Flag,
    Enum(&'static [&'static str]),
    Sizing,
    Min,
    Max,
    Msg,
    Tag,
    Str,
    Family,
    Resource,
    Keyframes,
    Enter,
    Gradient,
}

How a prop’s value is parsed (per transport) and encoded (binary slots).

Variants

F32

One number, or a "$length" token. Binary: 1 slot.

Color

One color: 0xRRGGBBAA number or #hex string, or a "$color" token. Binary: 1 slot (u32).

Flag

Marker, present-or-absent (false = absent). Binary: 0 slots.

Enum(&'static [&'static str])

One of a closed name list. Binary: 1 slot (index).

Sizing

A sizing: number | “fit” | “grow” | “N%” | a size expression ("clamp(400px, 80%, 1000px)", crate::calc) | {grow} | {percent}, or a "$length" token (a fixed length). Binary: 2 slots (mode, value), or with mode SIZE_MODE_CALC the mode and a strref, the expression’s spelling (v19); tagged, 1 slot (the index).

Min

A lower clamp: number | “fit” (the node’s own fit size on that axis) | a size expression, or a "$length" token. Binary: 2 slots (mode, value), a sizing’s first two modes, or SIZE_MODE_CALC and a strref; tagged, 1 slot (the index).

Max

An upper clamp: number | a size expression, or a "$length" token. Binary as a Min (v19; a plain number before): mode 0 and px, or SIZE_MODE_CALC and a strref; tagged, 1 slot (the index).

Msg

An arbitrary message payload (a Value). Binary: strref to JSON.

Tag

A message merged into the core’s own event under tag (onDrag, onKey, onHover, onLayout). Parsed and carried exactly like a Msg, but null is a legal value: the node still gets the behaviour (a key sink, a drag source) and its events simply carry no tag — so an app whose messages are a typed union needs no inert member just to name a sink.

Str

A plain string (a name, not a message). Binary: strref.

Family

A font family: one of the stock names (FAMILIES) or an installed or loaded family’s name, which the parser registers and turns into its handle. Binary: strref (v18).

Resource

A registered resource handle (a font or sound id): the integer form of the slotmap key. JSON/binary carry it as the 16-hex string the addon hands out; Lua as an integer; C as a uint64_t.

Keyframes

A keyframe stop list (crate::keyframes::parse reads the plain-data form). JSON/binary/Lua carry it like a Msg and parse it in the core; C passes a KuiKeyframe array.

Enter

An entrance (crate::enter::parse reads the plain-data form). Carried like a Msg and parsed in the core; C fills a KuiEnter.

Gradient

A gradient (crate::gradient::parse reads the plain-data form). Carried like a Msg and parsed in the core; C fills a KuiGradient.