rails/rails — pull request #12354 by kennyj (2013-09-25 10:47:10+00:00)
Title: Closes #12293. Strong parameters should permit nested number as key.

Closes #12293

Strong parameters should permit nested number as key.
Fields for style presume a value to be hash.
But a value is string depending on the situation,

It seems that the issue of original reporter is solved.

/cc @guilleiguaran