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iterator's Issues

Bug (in concurrent access) - Remove the item from the slice during iterations - bad idea

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x525660]

iterator.go:24 +0x1f0
iterator.go:30 +0xfb

24 line:

for index, key := range i.Keys {

And

func (i *Items) Del(key interface{}) {
    delete(i.Items, key)
    for id, val := range i.Keys {
        if val == key {
            i.Keys = append(i.Keys[:id], i.Keys[id+1:]...)
            return
        }
    }
}

Objective: add support for concurrent access

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