Musi uses words for logic and bit-like integer operations. Word operators keep condition lines readable.

Boolean logic

Use logic operators with Boolean values.

Operator	Meaning
`and`	produce `.True` only when both sides pass
`or`	produce `.True` when at least one side passes
`xor`	produce `.True` when exactly one side passes
`not`	flip `.True` to `.False`, or `.False` to `.True`

let hasHost := host /= "";
let hasPort := port > 0;
let canConnect := hasHost and hasPort;
let useFallback := not canConnect;

Name checks when they explain a rule. hasHost and hasPort is easier to trust than one long condition.

Integer bit operations

Use shl and shr for shifting integer bits left or right.

let readBit := 1 shl 0;
let writeBit := 1 shl 1;
let mask := readBit or writeBit;
let high := mask shr 1;

Use bit operators for flags, masks, and packed integer data. Do not use them as a replacement for records when fields have names.

Use parentheses when and and or appear together.

let allowed := isLocal or (hasToken and not expired);

The parentheses show that the token must exist and must not be expired.