Making Hashie class configurable

[milgner]

Grape currently hard-codes the use of Hashie::Mash. However this can lead to problems with certain parameter names. Sometimes though this is the preferred behaviour. To make use of Hashies built-in disable_warnings functionality, it would be great if the base class would be configurable.

One could even think about making Hashie completely optional and returning a regular Hash, seeing as how one also needs the hashie-forbidden_attributes gem when in a fairly up-to-date Rails environment. A lot of overhead just for the simple syntactical advantage of being able to write params.foo instead of params[:foo], imho.

[dblock]

This has been discussed in #1514 and #1448. I think you summarize the work well, so I'll leave this open as a top level issue.

Would definitely take a PR in those lines!

[dblock]

You might want to read http://code.dblock.org/2017/02/24/the-demonic-possession-of-hashie-mash.html.

[dblock]

Closing via #1610. Please give HEAD a try.