def merge2(a, b, merge_embedded=None):
"""TODO"""
if a == b:
return a
if isinstance(a, (list, tuple)) and isinstance(b, (list, tuple)):
return merge_seq(a, b)
if isinstance(a, (set, frozenset)) and isinstance(b, (set, frozenset)):
_die()
if isinstance(a, dict) and isinstance(b, dict):
r = {}
for (ak, av) in a.items():
bv = b.get(ak, None)
r[ak] = av if bv is None else merge2(av, bv, merge_embedded=merge_embedded)
for (bk, bv) in b.items():
if bk not in r:
r[bk] = bv
return r
if isinstance(a, Record) and isinstance(b, Record):
return Record(merge2(a.key, b.key, merge_embedded=merge_embedded),
merge_seq(a.fields, b.fields, merge_embedded=merge_embedded))
if isinstance(a, Embedded) and isinstance(b, Embedded):
m = (merge_embedded or merge_embedded_id)(a.embeddedValue, b.embeddedValue)
if m is None: _die()
return Embedded(m)
_die()