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Spec: must memoize when resolving substitutions

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Havoc Pennington 2014-10-22 13:54:08 -04:00
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@ -825,6 +825,15 @@ working with ordered maps rather than unordered maps, which is too
constraining. Implementations only have to track order for
duplicate instances of the same field (i.e. merges).
Implementations must set both `a` and `b` to the same value in
this case, however. In practice this means that all substitutions
must be memoized (resolved once, with the result
retained). Memoization should be keyed by the substitution
"instance" (the specific occurrence of the `${}` expression)
rather than by the path inside the `${}` expression, because
substitutions may be resolved differently depending on their
position in the file.
### Includes
#### Include syntax