math.big: Inaccurate conversion to int

[elliotchance]

Describe the bug

The big library does not handle the smallest value of an i32 correctly.

Expected Behavior

-2147483648
-2147483648
2147483647
2147483647
-1
-2147483648
2147483647
0

Current Behavior

-2147483648
-2147483648
2147483647
2147483647
-1
0
2147483647
0

Reproduction Steps

import math.big

fn main() {
	println('-2147483649'.int())
	println('-2147483648'.int())
	println('2147483647'.int())
	println('2147483648'.int())

	println(big.integer_from_string('-2147483649')!.int())
	println(big.integer_from_string('-2147483648')!.int()) // this is broken
	println(big.integer_from_string('2147483647')!.int())
	println(big.integer_from_string('2147483648')!.int())
}

Possible Solution

No response

Additional Information/Context

No response

V version

0.3.3 daa9034

Environment details (OS name and version, etc.)

V full version: V 0.3.3 7de3485.daa9034
OS: macos, macOS, 12.6, 21G115
Processor: 10 cpus, 64bit, little endian, Apple M1 Max

getwd: /Users/elliot
vexe: /Users/elliot/v/v
vexe mtime: 2023-03-14 00:22:49

vroot: OK, value: /Users/elliot/v
VMODULES: OK, value: /Users/elliot/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.37.0 (Apple Git-136)
Git vroot status: weekly.2023.10-50-gdaa90345
.git/config present: true

CC version: Apple clang version 14.0.0 (clang-1400.0.29.102)
thirdparty/tcc status: thirdparty-macos-arm64 a668e5a0

[penguindark]

@hungrybluedev Have you any spare time to have a look at this bug?

[hungrybluedev]

I might try to look at this in the weekend if that is okay. Have some assignments now.