T.number

A scalar. Bare T.number / T.number.integer are buildable with no .whereby() — an unbounded draw. .integer is whole; a bounded integer uses the same discrete floor path.

T.number.whereby({ min: 1, max: 100 });
T.number.whereby({ min: 0, max: { value: 1, exclusive: true } }); // [0, 1)
T.number.whereby({ min: 0 }); // [0, +∞)
T.number.integer.whereby({ min: 1, max: 100 });

Omit min or max to leave that end unbounded — the same policy as a bare T.number, not a default of 0. An omitted end is not stored; adapters see only the ends you named.

Add a distribution to shape how values cluster within a bounded range — see Distributions.

T.number.integer.sequence; // 1, 2, 3, ...
T.number.integer.big; // T.bigint

See Objects for .sequence.