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Forbid duplicating argument names #877

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Forbid duplicating argument names #877

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18 changes: 12 additions & 6 deletions spec/Section 3 -- Type System.md
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Original file line number Diff line number Diff line change
Expand Up @@ -873,9 +873,11 @@ of rules must be adhered to by every Object type in a GraphQL schema.
characters {"__"} (two underscores).
3. The field must return a type where {IsOutputType(fieldType)} returns {true}.
4. For each argument of the field:
1. The argument must not have a name which begins with the
1. The argument must have a unique name within that field;
no two arguments may share the same name.
2. The argument must not have a name which begins with the
characters {"__"} (two underscores).
2. The argument must accept a type where {IsInputType(argumentType)}
3. The argument must accept a type where {IsInputType(argumentType)}
returns {true}.
3. An object type may declare that it implements one or more unique interfaces.
4. An object type must be a super-set of all interfaces it implements:
Expand Down Expand Up @@ -1217,9 +1219,11 @@ Interface types have the potential to be invalid if incorrectly defined.
3. The field must return a type where {IsOutputType(fieldType)}
returns {true}.
4. For each argument of the field:
1. The argument must not have a name which begins with the
1. The argument must have a unique name within that field;
no two arguments may share the same name.
2. The argument must not have a name which begins with the
characters {"__"} (two underscores).
2. The argument must accept a type where {IsInputType(argumentType)}
3. The argument must accept a type where {IsInputType(argumentType)}
returns {true}.
3. An interface type may declare that it implements one or more unique
interfaces, but may not implement itself.
Expand Down Expand Up @@ -1981,9 +1985,11 @@ repeatable directives.
3. The directive must not have a name which begins with the characters
{"__"} (two underscores).
4. For each argument of the directive:
1. The argument must not have a name which begins with the
1. The argument must have a unique name within that directive;
no two arguments may share the same name.
2. The argument must not have a name which begins with the
characters {"__"} (two underscores).
2. The argument must accept a type where {IsInputType(argumentType)}
3. The argument must accept a type where {IsInputType(argumentType)}
returns {true}.

### @skip
Expand Down