'read-tree -m head' vs 'read-tree head'

From: Thomas Glanzmann <hidden>
Date: 2016-06-15 22:41:56

Hello,
I see in Linus merge script

	read-tree -m $merge_tree && checkout-cache -f -a && update-cache --refresh

Does this the same as read-tree $merge_tree would do?

	Thomas
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