Nx's default --parallel value not correctly set to 3

[mike-fam]

Current Behavior

If the --parallel tag is not explicitly set, then it defaults to undefined, although the documentation specifies that 3 is the default value.

Expected Behavior

It should be defaulted to 3, or the documentation should be updated to say the default value is undefined, meaning sequential execution

Github Repo

https://github.com/nrwl/nx/blob/master/packages/nx/src/utils/command-line-utils.ts#L168-L180

Steps to Reproduce

1. Run nx run-many --target=lint --all, without the --parallel tag.
2. All projects are linted sequentially.

Nx Report

NA

Failure Logs

NA

Additional Information

I believe the problem lies within this snippet:
https://github.com/nrwl/nx/blob/master/packages/nx/src/utils/command-line-utils.ts#L168-L180

If args['parallel'] is undefined, which it is when it’s not specified, then nxArgs['parallel'] is not set and defaults to undefined too.

I've tested this by adding this line directly below the snippet above:

	output.note({
		title: `Run with args.parallel being '${args['parallel']}', so nxArgs.parallel is set to '${nxArgs['parallel']}'`,
	});

Running nx run-many --target=lint --all on my repository (or any nx repository for that matter) gives:

>  NX   NOTE  Run with args.parallel being 'undefined', so nxArgs.parallel is set to 'undefined'

I can create a PR, but I need to know the Nx team's decision. Do you want this parallel value to default to 3 or do you want to update the documentation to match the current behaviour?

[AgentEnder]

It should default to 3, you can proceed with a PR if you'd like.

[github-actions]

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