Support for Accounts@{record}

Record literals only specify logical names. { field: 12}.
But records can have display names.
To specify a display name in a literal , use the Type@ prefix to a record. This gets display names from the given type.

For example:

Accounts@{ 'Account Name' : "Name 2"}.'Account Name'

Or this: (defined with display name, and then accessed via logical name)
Accounts@{ 'Account Name' : "Name 2"}.name

This is ok:
Accounts@{ name : "Name 2"}.name

This is an error since XXX isn't on the type.
Accounts@{ 'Account Name' : "Name 2", XXX :12}.'Account Name'

This works in Power Apps, but not supported in Fx - likely because of how symbols are wired up. (probably similar to #1337)

Start by investigating how symbols are wired for record literals and compare the shown cases with Power Apps behavior. Read the related issue #1337 for context; done means typed record literals accept display-name fields, reject fields absent from the type, and preserve logical-name access.