document todos

Author: theodorejb

todo.md

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+Double-check every LightnCandy and PHP Handlebars issue where I left a comment, to see if any need to be updated following the helpers changes.
+
+Comment with fixed after release:
+- https://github.com/zordius/lightncandy/issues/342
+- https://github.com/zordius/lightncandy/issues/316
+- https://github.com/zordius/lightncandy/issues/350
+- https://github.com/zordius/lightncandy/issues/292
+- https://github.com/zordius/lightncandy/issues/341
+
+
+[Valid use for Lightncandy::prepare()](https://github.com/zordius/lightncandy/issues/346)
+- Comment that PHP Handlebars supports compile() method just like Handlebars.js
+
+
+[SafeString fails with FLAG\_EXTHELPER | FLAG\_BESTPERFORMANCE](https://github.com/zordius/lightncandy/issues/354)
+- Comment suggesting to try PHP Handlebars, which can often outperform LightnCandy without needing any special flags.
+
+- Support callable for helper functions: https://github.com/zordius/lightncandy/issues/228
+
+
+[Unable to resolve partial when using sub expression and partial resolver](https://github.com/devtheorem/php-handlebars/issues/5)
+- Maybe comment with approach using helper rather than partial?