GoLang的字符串映射键中是否有任何字符串长度限制？

Is there any maximum length of Go's string map key? Actually I use https://github.com/OneOfOne/cmap instead of Go's map.

The question is, the key I use in that cmap is about 200-4000 characters in length, will it be a problem/gotchas?

import "gitlab.com/kokizzu/gokil/I"
import "sync/atomic"

var CACHE_IDX int64
var CACHE_KEYS cmap.CMap

func init() {
    CACHE_KEYS = cmap.New()
}

// change a really long string to a shorter one 
func RamKey_ByQuery(query string) string {
    nkey := CACHE_KEYS.Get(query)
    if nkey != nil {
        return nkey.(string)
    }
    new_idx := atomic.AddInt64(&CACHE_IDX, 1)
    ram_key := `:` + I.ToS(new_idx) // convert integer to string
    CACHE_KEYS.Set(query, ram_key)
    return ram_key
}

I think the only limit is your memory.