After calling clear() on a map several times, duplicate keys are allowed

[ratkingsminion]

Describe the bug

Code: https://play.vlang.io/p/e1f1a32c15

t := [30, 38, 36, 31, 39, 37, 24, 32, 25, 33, 18, 26, 11, 18, 12,
	  4, 10, 17, 16, 11, 3, 9, 2, 23, 30, 24, 16, 22, 23, 17, 9,
	  15, 10, 2, 8, 3, 1, 0, 7, 14, 29, 21]
println("array t len: ${t.len}")
mut m := map[int]int{}
for i in 0..12 {
	m.clear()
	mut n := map[int]int{}
	for e in t {
		m[e] = 0
		n[e] = 0
	}
	println("index ${i}")
	println(">> map m: ${m.len}") // - ${m.keys()}") // was cleared
	println(">> map n: ${n.len}") // - ${n.keys()}") // is a new map
}

Reproduction Steps

Run the code above

Expected Behavior

Map m and map n should always have the same number of elements.

Current Behavior

After around 8 iterations, map m begins to allow duplicate keys, which gets worse later on.

Output:

array t len: 42
index 0
>> map m: 31
>> map n: 31
index 1
>> map m: 31
>> map n: 31
index 2
>> map m: 31
>> map n: 31
index 3
>> map m: 31
>> map n: 31
index 4
>> map m: 31
>> map n: 31
index 5
>> map m: 31
>> map n: 31
index 6
>> map m: 31
>> map n: 31
index 7
>> map m: 31
>> map n: 31
index 8
>> map m: 32
>> map n: 31
index 9
>> map m: 36
>> map n: 31
index 10
>> map m: 36
>> map n: 31
index 11
>> map m: 36
>> map n: 31

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.7 fc31b44

Environment details (OS name and version, etc.)

V full version: V 0.4.7 fc31b44
OS: linux, Debian GNU/Linux 11 (bullseye) (VM)
Processor: 1 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz

getwd: /home/admin/playground
vexe: /home/admin/v/v
vexe mtime: 2024-09-01 14:42:05

vroot: OK, value: /home/admin/v
VMODULES: OK, value: .vmodules
VTMP: OK, value: /tmp/v_0

Git version: git version 2.30.2
Git vroot status: Error: fatal: detected dubious ownership in repository at '/home/admin/v'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v
.git/config present: true

CC version: cc (Debian 10.2.1-6) 10.2.1 20210110
thirdparty/tcc status: Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc
 Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc

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