This PR was submitted for the 2.7 branch but it was merged into the 2.8 branch instead (closes #9560). Discussion ---------- Add 2 solutions for the 'option with optional argument' problem While working on facile-it/paraunit#121, I discovered a tricky case with the Console component: using an option with an optional argument seemed impossible! The doc said: > There is nothing forbidding you to create a command with an option that optionally accepts a value. However, there is no way you can distinguish when the option was used without a value (command --language) or when it wasn't used at all (command). In both cases, the value retrieved for the option will be null. This is NOT TRUE. I've found two possible solutions to this issue (one myself, one in symfony/symfony#11572 (comment)) and this PR introduces them in the docs. I've also moved around the two tips/cautions which were at the end of the article, because with my reword it seemed nicer to me. Commits ------- d3f254d Minor simplifications 1aad365 Minor reword 99f9e3f Simplify the explanation leaving just one solution a05b002 Add 2 solutions for the 'option with optional argument' problem

Uh oh!