bencode output strangeness

[mat813]

When I send an integer value, it seems to be decoded correctly as it shows as a json number :

$ echo i12e | faq -f bencode -o json .
12

But when I ask that to be re-encoded as bencode, it gets translated into a string:

$ echo i12e | faq -f bencode -o bencode .
2:12
$ echo i12e | faq -f bencode -o bencode . | faq -f bencode -o json .
"12"

I do not speak go, so I am unsure wether the problem is here or in the bencode go library used by faq.

$ faq -v
github.com/jzelinskie/faq/cmd/faq version 0.0.7
    github.com/Azure/draft v0.16.0
    github.com/BurntSushi/toml v0.3.1
    github.com/alecthomas/chroma v0.8.2
    github.com/clbanning/mxj/v2 v2.5.5
    github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964
    github.com/dlclark/regexp2 v1.2.0
    github.com/ghodss/yaml v1.0.0
    github.com/globalsign/mgo v0.0.0-20181015135952-eeefdecb41b8
    github.com/go-xmlfmt/xmlfmt v0.0.0-20191208150333-d5b6f63a941b
    github.com/jbrukh/bayesian v0.0.0-20200318221351-d726b684ca4a
    github.com/sirupsen/logrus v1.8.0
    github.com/spf13/cobra v1.1.3
    github.com/spf13/pflag v1.0.5
    github.com/zeebo/bencode v1.0.0
    golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
    golang.org/x/sys v0.0.0-20200413165638-669c56c373c4
    golang.org/x/term v0.0.0-20201117132131-f5c789dd3221
    gopkg.in/yaml.v2 v2.4.0
    howett.net/plist v0.0.0-20201203080718-1454fab16a06