Deduplicate identical file patterns

[sindresorhus]

I think this stopped working with cf55e5c.

This

globby/index.js

Line 84 in 1c01091

.then(tasks => arrayUnion.apply(null, tasks));

doesn't work as it's an object, not simple patterns, and here

globby/index.js

Lines 113 to 117 in 9bf9983

	const newTask = getPattern(task, dirGlob.sync).map(glob => ({
	pattern: glob,
	opts: task.opts
	}));
	return tasks.concat(newTask);

I had to remove the logic to fix #54.

We probably have to use deep equality or improve the handling some other way. The readability of the code could also be improved.

// @kevva

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