The v0.4.7 fix removed the worked example from the doc comment, but
the same comment then EXPLAINED the bug using literal ERB tag chars
("ERB <%# %> terminates at the first %> sequence ... <%%= %%>"). ERB
scans for %> to close the outer <%# block, so the explanation
re-introduced the exact leak it described. Rewrote the comment to
contain zero % characters anywhere in its body.