"Come now, and let’s reason together" (1:18). Is the LORD inviting an argument?

In Hebrew reason is yakach (tap reason), which Brown-Driver-Briggs gives as "decide, adjudge, prove", and for the form in this verse it gives "come now and let us reason together". Strong's has "reciprocal, to argue". The chapter opened by calling heaven and earth to listen (1:2), and it has laid out a charge: "they have rebelled against me" (1:2), "Your hands are full of blood" (1:15). Then the LORD says, "Come now, and let’s reason together" (1:18), and goes on, "Though your sins are as scarlet, they shall be as white as snow. Though they are red like crimson, they shall be as wool" (1:18). The verse doesn't stand alone. The next two verses set two ways side by side: "If you are willing and obedient, you will eat the good of the land; but if you refuse and rebel, you will be devoured with the sword" (1:19-20). And 1:20 closes with words like the summons of 1:2: "for the LORD has spoken" (1:2), and "for the LORD’s mouth has spoken it" (1:20); in Hebrew both have the same verb for spoken. The chapter doesn't explain the words further, and these notes don't add an explanation.