Why can't I use a comma with gcloud?

I've been trying to call a Google Cloud Run Job with the following arguments:

[[{"platform":"...","organisation":"...","repo":"..."}]]

I've done this with the following invocation:

job_name="..."
region="..."
project="..."
event='[[{"platform":"...","organisation":"...","repo":"..."}]]'
gcloud run jobs execute $job_name --region $region --project=$project --args "$event"

However, each time this made its way up to Google Cloud, the Job failed to run, as the input was being remapped to:

[[{"platform":"..." "organisation":"..." "repo":"..."}]]
                   ^                    ^
                   ^   missing commas   ^

After some awkward searching around, this StackOverflow answer led me to the gcloud docs for escaping which seems a bit complicated for what I wanted to do, but it seems reasonable for some of the more complex use-cases the docs shared.

This is required as the gcloud run jobs execute docs note that --args requires Comma-separated arguments.

This results in the following tweak to our script:

event='[[{"platform":"...","organisation":"...","repo":"..."}]]'
# use the escaping
gcloud run jobs execute $job_name --region $region --project=$project --args "^#^$event"
#                                                                             ^^^
#                                                                             ^^^
#                                                                             ^^^

This makes sure that we delimit based on the #, which should never exist in the event we're processing.