package mailx

import (
    "net/textproto"
)

func copyMap[K comparable, V any](m map[K]V) map[K]V {
    mcopy := make(map[K]V)
    for k, v := range m {
        mcopy[k] = v
    }
    return mcopy
}

func CopyMIMEHeader(header textproto.MIMEHeader) textproto.MIMEHeader {
    return textproto.MIMEHeader(copyMap(map[string][]string(header)))
}