Unexpected rounding of integers

[jzajac]

Describe the bug
OKJSON will unexpectedly and without warning round large integers.

To Reproduce
Steps to reproduce the behavior:

1. Create a JSON file with a large integer (i.e., 60436225835668127)
2. Open in OKJSON.
3. Note the integer is rounded (i.e., for the above example, the app will show 60436225835668130).

App version 2.9.1 (214).

Expected behavior
OKJSON should not round integers. Alternatively, it should warn when it cannot represent a large number without rounding.

Screenshots
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Additional context
Add any other context about the problem here.

Opening this file in OKJSON will demonstrate the bug.

{
	"id": 60436225835668127
}