math: using `align` ⁺ and ⁻ not displayed

[Paul Menzel <paulepanter@users.sourceforge.net>]

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Dear ConTeXt folks,


using the Neo keyboard layout [1] I am able to insert the superscript +
and - directly: ^+=⁺ and ^-=⁻.

        […]
        ConTeXt  ver: 2011.05.18 22:26 MKIV  fmt: 2011.5.27  int: english/english
        […]
        mkiv lua stats  > math script replacements  - U+0207A:⁺ U
        +0207B:⁻ (n=4)
        […]

The following minimal example demonstrates the problem which is visible
when ⁺ or ⁻ is used between `\{start,stop}align`.

--- minimal example ---
\starttext
\placeformula
\startformula
	a⁺ \quad b⁻
\stopformula
\placeformula
\startformula\startalign
	a⁺ \NC≠ \NC b⁻ \NR
	a^+ \NC≠ \NC b^- \NR
\stopalign\stopformula

It should work though $a⁺$ and $b⁻$.
\stoptext
--- minimal example ---

Please find all files attached.


Thanks,

Paul


[1] http://neo-layout.org/

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\starttext
\placeformula
\startformula
	a⁺ \quad b⁻
\stopformula
\placeformula
\startformula\startalign
	a⁺ \NC≠ \NC b⁻ \NR
	a^+ \NC≠ \NC b^- \NR
\stopalign\stopformula

It should work though $a⁺$ and $b⁻$.
\stoptext

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