Summary: 6 instances, 5 unique

Text	Count
// FIXME: For now, we just merge all the inputs. This isn't	1
// FIXME: Support unix scheme?	1
// FIXME: this extra buffer copy is unfortunate	2
// FIXME: We should validate that there is 1 and only 1 providerMap. This is sort of managed by	1
private mutating func nextIndexedKey() -> CodingKey {  // TODO: Should be next?	1