:sig
u64 DTree::to_u64()

:see
>types
0_DTree
json_decode
int_val
to_bool
to_f64

:content
Reads a `DTree` value as an unsigned integer.

String values are parsed numerically. Boolean values become `1` or `0`. Negative values clamp to `0`.

Use this for counts, identifiers, limits, timestamps, and other non-negative numeric values stored inside a `DTree`.