After clear(), a map allows double entries

[ratkingsminion]

Describe the bug

Code: https://play.vlang.io/p/fe9eccd7aa

fn add(mut m map[int]int, v int) {
	m[v] = v
	println("${m.len} ${m}")
}

mut ints := map[int]int
add(mut ints, 20)
add(mut ints, 34)
add(mut ints, 20) // no double entry!
ints.clear()
add(mut ints, 20)
add(mut ints, 34)
add(mut ints, 20) // oops! double entry!

Reproduction Steps

Run the code above.

Expected Behavior

The last line should show 2 entries only,

Current Behavior

Output:

1 {20: 20}
2 {20: 20, 34: 34}
2 {20: 20, 34: 34}
1 {20: 20}
2 {20: 20, 34: 34}
3 {20: 20, 34: 34, 20: 20}

The last line says there are 3 entries now; but the entry "20" is twice in the map. This only happens after calling clear().

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.7 673ac0a

Environment details (OS name and version, etc.)

V full version: V 0.4.7 673ac0a
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 10:25:26

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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