void addReplyDoubleDistance(client *c, double d) {
    char dbuf[128];
    int dlen = snprintf(dbuf, sizeof(dbuf), "%.4f", d);
    addReplyBulkCBuffer(c, dbuf, dlen);
}
void addReplyDoubleDistance(client *c, double d) {
    char dbuf[128];
    int dlen = snprintf(dbuf, sizeof(dbuf), "%.4f", d);
    addReplyBulkCBuffer(c, dbuf, dlen);
}