Github user wangmiao1981 commented on the issue:
    I think the reason is because of the code below:
    `> serialize
    function (object, connection, ascii = FALSE, xdr = TRUE, version = NULL, 
        refhook = NULL) 
        if (!is.null(connection)) {
            if (!inherits(connection, "connection")) 
                stop("'connection' must be a connection")
            if (missing(ascii)) 
                ascii <- summary(connection)$text == "text"
        if (!ascii && inherits(connection, "sockconn")) 
            .Internal(serializeb(object, connection, xdr, version, 
        else {
            type <- if ( 
            else if (ascii) 
            else if (!xdr) 
            else 0L
            .Internal(serialize(object, connection, type, version, 
    `[1] TRUE`
    [1] FALSE
    So, `"2016-11-11"` and `NA` are serialized as different types (i.e., `NA` 
is not serialized with my R version). 

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