This seems more appropriate given the context, and additionally
the CJK symbols often render wider, as a full width CJK glyph,
while the math symbols render narrower. There was some related
discussion in bug#12948, where an analogous change was made
for \langle and \rangle.
* lisp/leim/quail/latin-ltx.el (latin-ltx--define-rules):
Change rules for \llbracket, \rrbracket and \ldata, \rdata to
generate Unicode code points in the Miscellaneous Mathematical
Symbols-A block (U+27E6, U+27E7 and U+27EA, U+27EB) instead of
the CJK Symbols and Punctuation block (U+301A, U+301B and
U+300A , U+300B).
Copyright-paperwork-exempt: yes
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