Strange object is beeing dispatched internally

[DoumanAsh]

One of my dependencies, eslint-loader uses object-hash to retrieve hash for object { formatter: [Function], eslintPath: 'eslint' } at https://github.com/MoOx/eslint-loader/blob/master/index.js#L172

The strange thing that for some reason internally it gets supplied with strange object for which toString returns Object string which causes error:

ERROR in ./src/main.js
Module build failed: TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be one of type string, TypedArray, or DataView
    at Hash.update (internal/crypto/hash.js:53:11)
    at write (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:168:22)
    at Object._string (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:299:7)
    at Object._object (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:215:30)
    at Object.dispatch (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:186:30)
    at D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:244:18
    at Array.forEach (<anonymous>)
    at Object._object (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:240:21)
    at Object.dispatch (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:186:30)
    at D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:258:23
    at Array.forEach (<anonymous>)
    at Object._array (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:257:20)
    at Object._object (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:215:30)
    at Object.dispatch (D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:186:30)
    at D:\repos\js-code\cpp-tour\node_modules\object-hash\index.js:244:18
    at Array.forEach (<anonymous>)
 @ multi (webpack)-dev-server/client?http://localhost:3333 ./src/main.js

I don't entirely understand how object-hash works but it seems to be happening due to this line https://github.com/puleos/object-hash/blob/master/index.js#L173-L175
I'm wondering is maybe some replacer used internally? As eslint-loader itself doesn't use any options at all