TXT files with digits are detected as json

[IevgenLuzan]

Attach the file for which the detection is inaccurate
11.txt

Expected MIME type
txt

Returned MIME type
json

Version of the library you are using
the semver version or the hash of the commit
1.3.0
Output of go version
...
1.16.6
Additional context
Add any other context about the problem here.

Reproduсed with any txt file that contents just digits.

[gabriel-vasile]

It reproduces with a single string too.
I guess the fix is to return json just for files containing a json object or a json array.
Just 1234 or "abcd" should return txt.
This would be inline with that file --mime 11.txt does too.

[IevgenLuzan]

Is there any chanse override that behavior for now?
mimetype.Extend does not help here.
@gabriel-vasile

[gabriel-vasile]

I made the PR with the fix. If you don't want to wait until the new version is released, you can run:

go get github.com/gabriel-vasile/mimetype@dd10de59634d

Thank you for reporting this issue.

[IevgenLuzan]

Thank you for the quik help.
It works.