Value size limits on git config files

When trying to incorporate large aliases into my ~/.gitconfig file via
`git config --global "!$(cat myscript)"`, I determined that there
appears to be a limit to the size of a value.  When exceeded, git
prints out "fatal: bad config file line 82 in ~/.gitconfig".  I was
able to strip enough comments and such from myscript that it then no
longer invalidated the config once the value was less than 1024 chars.
 (Minor aside, I am doing this as a small experiment to potentially
aid in synchronizing all my git behaviors across machines by inlining
them into the config file.  Whether this is a good path to explore or
not is a separate issue.)

My questions are:
   Is this 1024 char limit on config file values documented somewhere?
   Should it be considered a bug that git config can write out config
files which it can not then read (e.g. it should be changed to either
enforce the value-length limit during writing, or the parser updated
to handle large values)?

Thanks, Jeff