doc/tutorial/basics/rangedef.md

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_Types and Values_

# Predefined Ranges

CUE numbers have arbitrary precision.
Also there is no unsigned integer type.

CUE defines the following predefined identifiers to restrict the ranges of
integers to common values.

```
uint      0..int
uint8     0..255
int8      -128..127
uint16    0..65536
int16     -32_768...32_767
rune      0..0x10FFFF
uint32    0..4_294_967_296
int32     -2_147_483_648..2_147_483_647
uint64    0..18_446_744_073_709_551_615
int64     -9_223_372_036_854_775_808..9_223_372_036_854_775_807
int128    -170_141_183_460_469_231_731_687_303_715_884_105_728..
              170_141_183_460_469_231_731_687_303_715_884_105_727
uint128   0..340_282_366_920_938_463_463_374_607_431_768_211_455
```

<!-- CUE editor -->
```
positive: uint
byte:     uint8
word:     int32

{
    a: positive & -1
    b: byte & 128
    c: word & 2_000_000_000
}
```

<!-- result -->
```
a: _|_
b: 128
c: 2000000000
```