7 digit strings are improperly detected as a date

[mfrieling]

Describe the bug
This is a regression of #54 where 4 digit strings have been improperly detected as a date. In 165afc2 an additional check has been introduced that the string must have at least 6 characters.

In my current situation the string "2022338" in an object will get parsed as a date.

To Reproduce

const x = jsonStringifyDate.parse('{"str":"2022338"}');
console.log(x.str); // PRINTS: Sun Dec 04 2022 00:00:00 GMT+0100 (Central European Standard Time)

The interesting part here is, that Dec 4ᵗʰ is the 338ᵗʰ day of the year. So "2022367" would not parse as a date. See moment.js - Supported ISO 8601 strings for details.

Expected behavior
Expect it to parse it as a string and not a date.

In my case the value represents a customer number but could also be i.e. a matriculation number (in Austria 8 digits).

Sugested solution
Don't allow the "Basic (short)" date formats allowed by ISO 8601 to be parsed as date (optionally provide a setting to enable these formats which is disabled by default).
If short date formats are disabled test all strings > 4 and <= 8 characters if they have a - as 5ᵗʰ character.

[fmenezes]

@mfrieling thanks for the bug report, I'll look into it

[mfrieling]

Closing as the problem can be solved individually using the fnCheck function by either checking the key name or the value itself from #125. This even allows more fine-grained control over the parsing process.