Parse constant values separate from locations that permit variables #1145
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The graphql spec (https://spec.graphql.org/draft/#sec-Appendix-Grammar-Summary.Source-Text)
declares that in some location a value cannot be a variable.
This is especially the case in the schema definition language, where
setting the values of directive arguments to a variable is not permitted.
Also in executable documents, setting the default value of a variable definition
to a variable is not permitted.
See graphql/graphql-spec#918 (comment)
for more on this.