On 5/15/2019 11:48 PM, Alan Bowen wrote:

The following: \setupdirections[bidi=global] \definefallbackfamily[mainface][serif][SBL Hebrew][range={0591-05F4,FB1D-FB4F}] \definefontfamily[mainface][serif][TeX Gyre Termes] \setupbodyfont[mainface, 10pt] \starttext xxxx yyyy zzzz \setupalign[rtl]{ ﬡﬡﬡﬡﬡﬡﬢﬢﬢﬢﬢ } \setupalign[ltr]aaaa bbbb \stoptext  sets as it should with ConTeXt  ver: 2018.09.13,  LuaTeX, Version 1.09.0 (and several betas later).

But with ConTeXt  ver: 2019.05.12, LuaTeX, Version 1.10.1 it complains with: lua error       > lua error on line 8 in file ...test-03.tex:

...eXt/tex/texmf-context/tex/context/base/mkiv/font-oup.lua:1317: bad argument #1 to 'concat' (table expected, got number)

 1     \setupdirections[bidi=global]  2  3     \definefallbackfamily[mainface][serif][SBL Hebrew][range={0591-05F4,FB1D-FB4F}]  4  5     \definefontfamily[mainface][serif][TeX Gyre Termes]  6  7     \setupbodyfont[mainface, 10pt]  8 >>  9     \starttext 10     xxxx yyyy zzzz \setupalign[rtl]{ 11     ﬡﬡﬡﬡﬡﬡﬢﬢﬢﬢﬢ 12     } 13     \setupalign[ltr]aaaa bbbb 14 15     \stoptext 16

mtx-context     | fatal error: return code: 256

Has something changed in how such l2r fonts should be invoked? No, more a side effect of some optimization (needed for certain kind of somewhat weird fonts).

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