when tonumber() is recorded as nil, specialize to the failing ctype#1

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javierguerragiraldez wants to merge 1 commit intolua-users-foundation:v2.1from

javierguerragiraldez:ffi_tonumber

Commits on Apr 6, 2018

bug report #408, when tonumber() is recorded as nil, specialize to the failing ctype
Javier Guerra
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