Symbol-valued properties are not copied

[gabrielschulhof]

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• 1. The issue provides a reproduction available on Github, Stackblitz or CodeSandbox

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• 2. A failing test has been provided
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Describe the bug

mock strips property symbols.

To Reproduce Steps to reproduce the behavior:

At https://github.com/ardatan/graphql-tools/blob/master/packages/mock/src/utils.ts#L34, the code does not iterate over getOwnPropertySymbols.

Expected behavior

Objects are copied, including their symbol-keyed properties.

Environment:

• OS:
• @graphql-tools/...:
• NodeJS:

Additional context

I don't understand why these properties are skipped. In fact, there is a test to ensure that they are skipped. It was added at 6877b91. Would it be possible to not skip these properties?

Background: We use symbols for annotating and resolving abstract types.