Mutating array methods like insert and prepend work without mut declaration

[ttytm]

Describe the bug

a0 := [1, 2]
a1 := [3, 4]
a2 := [5, 6]

a2.prepend(a1)
a1.insert(0, a0)

dump(a2)
dump(a1)

a2: [3, 4, 5, 6]
a1: [1, 2, 3, 4]

Expected Behavior

Arrays that are mutated require a mut declaration like the methods function signature and examples indicate.

pub fn (mut a array) insert(i int, val voidptr)
// ...
// Example:
mut a := [1, 2, 4]
a.insert(2, 3)          // a now is [1, 2, 3, 4]
mut b := [3, 4]
b.insert(0, [1, 2])     // b now is [1, 2, 3, 4]

E.g. working mut requirement for the pop method:

a := [1, 2]
a.pop() // Diagnostics: `a1` is immutable, declare it with `mut` to make it mutable []

Possible Solution

No response

Additional Information/Context

No response

V version

⬇️

Environment details (OS name and version, etc.)

V full version: V 0.4.8 988f8b4.ee3a182
OS: linux, "EndeavourOS Linux"
Processor: 16 cpus, 64bit, little endian, 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz

getwd: /home/t/Sync/Dev/V/projects/grd
vexe: /home/t/Sync/Dev/V/v/v
vexe mtime: 2024-11-13 18:52:01

vroot: OK, value: /home/t/Sync/Dev/V/v
VMODULES: OK, value: /home/t/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.47.0
Git vroot status: weekly.2024.46-18-gee3a182d-dirty
.git/config present: true

CC version: cc (GCC) 14.2.1 20240910
emcc version: N/A
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

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_{Huly®: V_0.6-21295}