<div dir="ltr"><div class="gmail_default" style="font-family:simhei,sans-serif">In the current spec, strictness of the built-in functions are implementation-dependent behaviors. This proposal is going to fix this problem.</div><div class="gmail_default" style="font-family:simhei,sans-serif"><a href="https://github.com/Jack-Works/proposal-strict-built-in-functions" style="font-family:Arial,Helvetica,sans-serif">https://github.com/Jack-Works/proposal-strict-built-in-functions</a></div><div class="gmail_default" style="font-family:simhei,sans-serif"><br></div></div>