Besides curiosity, there's a more practical reason that I'm asking.
In northern Ostrobothnian (roughly above Vasa; compared to southern below Vasa) there is still an archaic, seemingly strong comparative,
hvítaran, which also seems to appear in a reduced form in the southern
hvítán.
Compare the conventional inflection regimes with the hypothetical strong comparative — using the masculine inflection of
hvít (white).
Positive, strong | PG. | ON. | dial. |
| nom. | *hwīt-az | hvít-r | hvít |
| acc. | *hwīt-an-ōN | hvít-an | hvít-an |
| dat. | *hwīt-amm-ai | hvít-um | ? |
| gen. | *hwīt-as | hvít-s | hvít-as |
Positive, weak | PG. | ON. | dial. |
| nom. | *hwīt-ô | hvít-i | hvít-a |
| acc. | *hwīt-anuN | hvít-a | hvít-a |
| dat. | *hwīt-ini | hvít-a | hvít-a |
| gen. | *hwīt-iniz | hvít-a | hvít-as |
Comparative, strong | PG. | ON. | dial. |
| nom. | *hwīt-ōz-az | *hvít-ar-r | ? > hvít-án |
| acc. | *hwīt-ōz-anōN | *hvít-ar-an | hvít-ar-an > hvít-án |
| dat. | *hwīt-ōz-amm-ai | *hvít-ar-um | ? |
| gen. | *hwīt-ōz-iniz | *hvít-ar-s | hvít-ar-as > hvít-án-as |
(NOTE: -án- reanalysed as the comparative stem suffix)Comparative, weak | PG. | ON. | dial. |
| nom. | *hwīt-ōz-ô | hvít-ar-i | *hvít-ar-a |
| acc. | *hwīt-ōz-anuN | hvít-ar-i | *hvít-ar-a |
| dat. | *hwīt-ōz-ini | hvít-ar-i | *hvít-ar-a |
| gen. | *hwīt-ōz-iniz | hvít-ar-i | *hvít-ar-as |
Superlative, strong | PG. | ON. | dial. |
| nom. | *hwīt-ōst-az | hvít-ast-r | hvít-ast |
| acc. | *hwīt-ōst-an-ōN | hvít-ast-an | hvít-ast-an |
| dat. | *hwīt-ōst-amm-ai | hvít-ast-um | ? |
| gen. | *hwīt-ōst-as | hvít-ast-s | hvít-ast-as |
Superlative, weak | PG. | ON. | dial. |
| nom. | *hwīt-ōst-ô | hvít-ast-i | hvít-ast-a |
| acc. | *hwīt-ōst-anuN | hvít-ast-a | hvít-ast-a |
| dat. | *hwīt-ōst-ini | hvít-ast-a | hvít-ast-a |
| gen. | *hwīt-ōst-iniz | hvít-ast-a | hvít-ast-as |
Note that this could very well be an innovation rather than a conserved feature. What is also interesting is that the -án- form does not show any sign of retroflection. Both regions with and without retroflection show a plain nasal -án [ɑːn] rather than retroflexed [ɑːɳ].
The change
/VrC/ > /VːCʳ/ (where C is /n, t, (d), s, l/, V is a low vowel (especially /ɑ/), and /ʳ/ indicates retroflection) is both productive and strong, so it's not only unusual, but very puzzling, to see
hvítaran change into
hvítán without retroflection.
At least if you consider it to be a modern innovation. If it was indeed an archaic feature (before retroflection began to affect words) it would be easier to see the change *-aran > *-arn > *-án.
So I'm kind of scratching my head bald at the moment.
It doesn't necessitate an archaic strong inflection of comparatives, but it's kind of ends up weird without one. Because there's so little documented material on Ostrobothnian (and Nylandian, the both are very probably closely related) it's even tougher. I also don't have any extra-Ostrobothnian material showing similar features/changes, so I don't have much to compare it with either
