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Changes based on feedback:

This preserves the behavior of explicit null values taking precedence over default values, greatly reducing the scope of breaking changes.

This adds a change to argument coercion to enforce null checking on variable valuesand removes one validation rule: VariablesDefaultValueAllowed. This allows supplying default values to non-nullable variables, widening the gap between "required" and "nullable". It also changes the validation rules for arguments - allowing non-null arguments with default values to be omitted.

This preserves all existing behavior (with the critical exception of no longer allowing `null` values into non-null arguments) while allowing queries which were previously considered invalid to be valid.

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