groupBy keys become strings; example is not reproducible

[David Rauschenbach]

I'm having trouble reproducing the groupBy example:

_.print(_.groupBy({4.3, 6.1, 6.4}, function(n)
   return math.floor(n)
 end))
 --> {[4]={4.3}, [6]={6.1, 6.4}}

What I get instead is a result keyed by strings instead of numbers:

$ lua
Lua 5.2.4  Copyright (C) 1994-2015 Lua.org, PUC-Rio
> _ = require 'lodash'
> _.print(_.groupBy({4.3, 6.1, 6.4}, function(n) return math.floor(n) end))
{["6"]={6.1, 6.4}, ["4"]={4.3}}

[David Rauschenbach]

I removed the call to _.str() in the groupBy function and verified that the results are now correct.

I also notice that the unit tests are asserting the wrong key datatypes, which is not consistent with the source data or the README example.

[Daniel Moghimi]

Thanks for reporting this. Would you please create a pull request with the fix?

[Flemming Madsen]

Done (#9)