# bin/set-f64 Return a copy of `$bytes` with a 64-bit float written at `offset` (little-endian). Byte strings are immutable — the original `$bytes` is unchanged. ## Syntax

[bin/set-f64 $bytes $offset $value]

## Parameters - `$bytes` — byte string to copy and write into - `$offset` — 0-based byte offset - `$value` — value to write (cast to the 64-bit float width) ## Examples

def buf [bin/set-f64 [bin/zeros 8] 0 3.25]
[bin/f64-at $buf 0] # → 3.25

## Returns New byte string. A negative or out-of-bounds offset returns `%Err{:message}`. ## See Also `bin/f64-at`, `bin/set-f64-be`, `bin/set-bytes`, `bin/bytes`