Should it be possible to deconstruct structs?

[popematt]

There is no way to deconstruct a struct value or access the field names of a struct, which means that there is no way for a user to create a macro that can do something like this:

(:foo 1 2 3 { 'api-version':2, 'client-request-id': "yF8q3pZKRZ3dDfzaNy6N" })
=>
{
  foo: 1,
  bar: 2,
  baz: 3,
  'X-api-version': 2,
  'X-client-request-id': "yF8q3pZKRZ3dDfzaNy6N"
}

Hypothetically, one might be able to allow flatten to flatten a struct into pairs of field names and values, and then add some syntax to for that can bind to both the field name and the value, enabling the creation of a macro like this:

(macro foo (foo bar baz additional_properties)
       (make_struct
         ((.literal foo) foo)
         ((.literal bar) bar)
         ((.literal baz) baz)
         (.for (( [name, value] (.flatten additional_properties)) 
           (.field (make_string "X-" name) value)))

However, this is not necessarily the only or optimal solution.