boundary spec hint the validation type

[JunchengXue]

No description provided.

[tylerflex]

I think the proper way to handle this (consistent with how we do it in other places) is to include

from .types import annotate_type

and then include it here

tidy3d/tidy3d/components/boundary.py

Line 344 in d2196e5

plus: BoundaryEdgeType = pd.Field(

See here

tidy3d/tidy3d/components/data/sim_data.py

Line 53 in 70cb2e5

data: Tuple[annotate_type(MonitorDataType), ...] = pd.Field(

However, maybe we should instead wrap pd.Field to always include a discriminator="type" kwarg?

Another comment: the "type" string should not be hardcoded, instead it should be imported from types.py as TAG_TYPE_STR

tidy3d/tidy3d/components/types.py

Line 21 in d2196e5

TYPE_TAG_STR = "type"

In case it changes in the future.

[tylerflex]

Note: I made PR #605 to handle the TYPE_TAG_STR issue.
I tried annotate_type() and got obscure errors, will need to revisit this some other time.
Perhaps providing discriminator=TYPE_TAG_STR in all fields is the way forward. Made issue #604 to remind myself to look into it in the future.