Cannot handle IPv6 addresses in -w list

[jadams41]

Trying to specify IPv6-format addresses seems to have trouble with the rcmd_type-specifying syntax:

A list of hosts may also be preceded by "user@" to specify a remote
username other than the default, or "rcmd_type:" to specify an alternate
rcmd connection type for these hosts.

I.e.:

> pdsh -R exec -w 2a03:5640:f13b:84::9299,2a03:5640:f13b:6::9a32 ssh -F /Users/ethanadams/.ssh/config.pdsh %h hostname
No such rcmd module "2a03"
pdsh@Ethans-MacBook-Pro: Failed to register rcmd "2a03" for "5640:f13b:84::9299"

I wasn't able to find any information about this, so I quickly looked through the source and it seems that there isn't any way to avoid having the ':'s in the IPv6 target addresses be treated as rcmd specifiers (other than by explicitly specifying rcmd prior to the IPv6 addr like -w <rcmd>:<ipv6_addr>,<rcmd>:<ipv6_addr>,...).

Was wondering if there was anything I missed here or if this indeed seems like unexpected behavior?

---

Version:

> pdsh -V
pdsh-2.35 (+readline)
rcmd modules: ssh,exec (default: ssh)
misc modules: dshgroup (*conflicting: netgroup)
[* To force-load a conflicting module, use the -M <name> option]