<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"John Rose" <john.r.rose@oracle.com><br><b>To: </b>"Brian Goetz" <brian.goetz@oracle.com><br><b>Cc: </b>"daniel smith" <daniel.smith@oracle.com>, "valhalla-spec-experts" <valhalla-spec-experts@openjdk.java.net><br><b>Sent: </b>Wednesday, July 13, 2022 10:23:50 PM<br><b>Subject: </b>There are five buckets now<br></blockquote></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><div style="font-family: sans-serif;"><div class="markdown" style="white-space: normal;">
<p dir="auto">FTR, I’m really happy with the user model as of this point.</p>
<p dir="auto">The things I like best about it are:</p>
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<li><code style="margin: 0; padding: 0 0.4em; border-radius: 3px; background-color: #F7F7F7;">Object::getClass</code> returns a predictable ref-mirror (I always wanted that)</li></ul></div></div></blockquote><div><br></div><div>so we have to tweak the return type of getClass() to it returns something like Class<? extends Erasure[T.ref]> and also C.val.class has to be typed Class<C>.</div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><div style="font-family: sans-serif;"><div class="markdown" style="white-space: normal;"><p dir="auto"><br data-mce-bogus="1"></p>
<p dir="auto">— John</p></div></div></blockquote><div><br></div><div>Rémi<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><div style="font-family: sans-serif;"><div class="markdown" style="white-space: normal;">
<p dir="auto">On 13 Jun 2022, at 16:04, Brian Goetz wrote:</p>
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<p dir="auto">I've done a little more shaking of this tree. It involves keeping the notion that the non-identity buckets differ only in the treatment of their val projection, but makes a further normalization that enables the buckets to mostly collapse away.</p>
<p dir="auto">"value class X" means:</p>
<p dir="auto"> - Instances are identity-free<br>
- There are two types, X.ref (reference, nullable) and X.val (direct, non-nullable)<br>
- Reference types are atomic, as always<br>
- X is an alias for X.ref<br>
…</p>
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