Omit non-enumerable, symbolic members in snapshots

🐛 Bug Report

When upgrading from MobX 4.3.0 to 5.6.0, new snapshot information is created using jest

This information is largely extraneous, and when added typically triples the size of the snapshot file (best case) and sometimes grows file by 10x (worst case)

exports[`Size Picker Snapshot not clicked 1`] = `
<MuiThemeProvider>
  <SizePicker
    store={
      SizePickerStore {
        "defaultValue": 8,
        "idPrefix": "size-picker",
        "internalId": "1",
        "isExpanded": false,
        "isMousePressed": false,
        "label": undefined,
        "onChange": Event {
          "listeners": Array [],
          "publishRecursionCount": 0,
        },
        "onHideShow": [Function],
        "onKeyDown": [Function],
        "onMouseDown": [Function],
        "onMouseUp": [Function],
        "value": 8,
+      Symbol(mobx did run lazy initializers): true,
+      Symbol(mobx administration): ObservableObjectAdministration$$1 {
+      "defaultEnhancer": [Function],
+      "keysAtom": Atom$$1 {
+        "diffValue": 0,
+        "isBeingObserved": false,
+        "isPendingUnobservation": false,
+        "lastAccessedBy": 0,
+        "lowestObserverState": 2,
+        "name": "[e-mail]",
+        "observers": Set {},
          },
          "name": "SizePickerStore@26",
          "target": [Circular],
          "values": Map {
            "value" => 8,
            "isExpanded" => false,
            "label" => undefined,
          },
        },
      }
    }
  >

To Reproduce

Steps to reproduce the behavior: Using mobx and mobx-react, create an @observer react component that receives props including an @observable object. Write a test file that mounts this component and takes a snapshot

Expected behavior

according to @mweststrate of MobX: the problem is that it should ignore non-enumerable (symbolic) members. It was fixed a while ago for toEqual, but not yet for snapshots

link to mobx issue

Run npx envinfo --preset jest

System:
    OS: Windows 10
    CPU: (8) x64 Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
  Binaries:
    Node: 10.13.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.12.3 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 5.0.4 - C:\Program Files\nodejs\npm.CMD

[mweststrate]

Suggested alternative title for this issue: Omit non-enumerable, symbolic members in snapshots

[github-actions[bot]]

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