src/basilisp/lang/runtime.py
def contains(coll, k):
    """Return true if o contains the key k."""
    if isinstance(coll, IAssociative):
        return coll.contains(k)
    return k in coll
def contains(coll, k):
    """Return true if o contains the key k."""
    if isinstance(coll, IAssociative):
        return coll.contains(k)
    return k in coll
Return true if o contains the key k.