Subj : Re: [SpiderMonkey] JS_Get/SetPrivate truncates 0x1 bit
To   : Brian Barnes
From : Brendan Eich
Date : Sat May 22 2004 12:24 pm

JS_SetPrivate should be passed a pointer aligned on a 0 mod 2 or wider 
boundary.  That's the design, it's for private data structure 
association.  The tagging is necessary to keep the GC from chasing an 
unknown pointer.

The docs botch this, alas.

/be

.