FoldBounds restated six Config fields, DEFAULT_BOUNDS restated them again, and
resolveBounds listed them a third time. Deriving the type from the defaults leaves
one source for the bound vocabulary, and Config now composes Partial<FoldBounds>
with Partial<PluginSettings> — which also declares defaultDeltaBase, a field the
schema already carried while the interface omitted it.
DecodeSpans and DecodeCounts were byte-identical aliases of the same record shape.
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