It is the second bit which is set for non-numeric immediates and the second bit is bit 1. begining -> beginning
Pull request: https://github.com/WebKit/WebKit/pull/25696
Committed 275951@main (b2b0e1929a73): <https://commits.webkit.org/275951@main> Reviewed commits have been landed. Closing PR #25696 and removing active labels.
<rdar://problem/124423774>