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static public Object get(Object coll, Object key){
	if(coll instanceof ILookup)
		return ((ILookup) coll).valAt(key);
	return getFrom(coll, key);
}

static Object getFrom(Object coll, Object key){
	if(coll == null)
		return null;
	else if(coll instanceof Map) {
		Map m = (Map) coll;
		return m.get(key);
	}
	else if(coll instanceof IPersistentSet) {
		IPersistentSet set = (IPersistentSet) coll;
		return set.get(key);
	}
	else if(key instanceof Number && (coll instanceof String || coll.getClass().isArray())) {
		int n = ((Number) key).intValue();
		if(n >= 0 && n < count(coll))
			return nth(coll, n);
		return null;
	}
	else if(coll instanceof ITransientSet) {
		ITransientSet set = (ITransientSet) coll;
		return set.get(key);
	}

	return null;
}