Lossless integers

JavaScript number is IEEE-754 float. Integers above 2^53 (9_007_199_254_740_991) cannot be represented exactly. Comfy seeds are 64-bit. JSON.parse / JSON.stringify will silently change them.

Journey:

JS bigint
    ↓
 Graph IR:  { "$int": "18446744073709551615" }
    ↓
 compiler
    ↓
 raw exact JSON numeric literal in the /prompt body
    ↓
 Comfy (Python)

IR stays safe under ordinary JSON.parse because of the tag. The wire form is assembled by string concatenation so bigints never pass through JSON.stringify.

Use 42n in TypeScript. cwf run --param seed=42 parses as integer; large seeds should be passed without going through JS Number.

run.json.compiledJson is stored as a string for this reason. Do not parse it if you need the seed intact.

Lossless integers ​

Lossless integers