The text input for "assign to" starts out pre-filled to an invalid value

[cjerdonek]

When creating a new issue, I noticed that the text input for the "assign to" field starts out prepopulated as < default >. I believe this should instead be the empty string with a placeholder value for display. This is a little confusing because it's not clear someone needs to delete the pre-filled value. In the past, I have tried submitting the default value as is, thinking it might mean self-assigning to me, but it resulted in being marked as assigned with noone getting assigned.