Revert "Add ref-counted string slices (#1175)" #1185
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This change seems to have introduced a seemingly impossible bug in a real-world code base where values flip to JS_NULL for no discernible reason.
My best guess is something manipulating string data directly, without being aware of slice strings, but it's impossible to track down where. The weird thing is that the value flipping to null isn't even a string, it appears to be an array.
This reverts commit 08db51a. This reverts commit 62b4eed.
Fixes: #1178