Incompatibility with urql since v1.8.8

[Schleuse]

Describe the bug

Due to changes made in #396, version 1.8.8 throws the following error when paired with urql:

Uncaught TypeError: Cannot set property loc of #<Object> which has only a getter
    at stringifyDocument (request.ts:74:19)
    at hashDocument (request.ts:107:17)
    at keyDocument (request.ts:136:48)
    at createRequest (request.ts:171:17)
    at useRequest.ts:20:21
    at mountMemo (react-dom.development.js:16406:19)
    at Object.useMemo (react-dom.development.js:16851:16)
    at Object.useMemo (react.development.js:1650:21)
    at useRequest (useRequest.ts:19:16)
    at useQuery (useQuery.ts:225:19)

The introduced loc property tries to be set here by urql.

Maybe a setter for the loc property should be added as well.

Reproduction

Use urql and gql.tada version 1.8.8

gql.tada version

gql.tada v1.8.8

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