Clarify type syntax

[pravdomil]

Since type can only define sum(or) type let's use type or keyword instead, to make it explicit.

Or maybe:

And type - zero and more values type alias
Or type - zero and more variants type or
Opaque type - basically wrapper around one value type opaque

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[lue-bird]

To me it seems somewhat confusing to call single-variant types "or":

type or Email
    = Email { local : Local, domain : Domain }

[pravdomil]

that is how it works now,
it it still an or type with one variant

but that is another topic:
if or type can have only one variant

I would suggest following:

And type - zero and more values type alias
Or type - zero and more variants type or
Opaque type - basically wrapper around one value type opaque

That also solves a problem how data should be serialized into text/binary format.

Now, it is not clear if:
Or type with one variant should be treated as just the value or variant index and the value.