Deprecate Kernel.float/1 in favor of explicit conversion

Author: José Valim

CHANGELOG.md

@@ -27,6 +27,7 @@
   * [File] `File.iterator/1` and `File.biniterator/1` are deprecated in favor of `IO.stream/1` and `IO.binstream/1`
   * [File] `File.iterator!/2` and `File.biniterator!/2` are deprecated in favor of `File.stream!/2` and `File.binstream!/2`
   * [Kernel] Deprecate recently added `quote binding: ...` in favor of the clearer `quote bind_quoted: ...`
+  * [Kernel] Deprecate `Kernel.float/1` in favor of a explicit conversion
   * [Record] `Record.__index__/2` deprecated in favor of `Record.__record__(:index, key)`
 
 * backwards incompatible changes

lib/elixir/lib/kernel.ex

@@ -607,6 +607,7 @@ defmodule Kernel do
   """
   @spec float(number) :: float
   def float(number) do
+    IO.write "[WARNING] Kernel.float is deprecated, please do an explicit conversion instead\n#{Exception.format_stacktrace}"
     :erlang.float(number)
   end
 

lib/elixir/lib/string.ex

@@ -854,7 +854,7 @@ defmodule String do
         {int_result, int_remainder} = :string.to_integer(charlist)
         case int_result do
           :error -> :error
-          _ -> {float(int_result), list_to_binary(int_remainder)}
+          _ -> {:erlang.float(int_result), list_to_binary(int_remainder)}
         end
       _ -> {result, list_to_binary(remainder)}
     end

lib/elixir/src/elixir_dispatch.erl

@@ -381,7 +381,7 @@ in_erlang_functions() ->
     { byte_size, 1 },
     % { date, 0 },
     { exit, 1 },
-    { float, 1 },
+    % { float, 1 },
     { float_to_binary, 1 },
     { float_to_list, 1 },
     { hd, 1 },