How many of ʔu? A featural decomposition of A’ingae augmentatives

In A’ingae (iso 639-3: con), the augmentative evaluative -ʔu AUG and the augmentative adjectivizer -ʔu AA are segmentally identical and have the same -ʔ allomorph when followed by a vowel. However, they trigger different stress assignment—the evaluative -ʔu AUG stresses the second syllable to its left, while the adjectivizer -ʔu AA preserves underlying stress (if present), and stresses the preceding syllable otherwise.
To account for both their similarities and differences, I propose that the two morphemes realize complex feature bundles. The evaluative -ʔu AUG expones [AUG, EVAL], and the adjectivizer -ʔu AA expones [AUG, a]. The shared feature [AUG] captures the fact that both uses have the same segmental allomorphy. The differentiating features ([EVAL] and [a]) are independently shown to trigger distinct stress patterns.
The A’ingae data demonstrate that morphological exponence may involve not only segmental content, but also phonological processes (Sande, 2020; Sande, Jenks, and Inkelas, 2020; Dąbkowski, 2024b, 2025), and that the realization of any single morpheme may stem from a non-trivial interplay of elements introduced by different features.