Merge #4303 'vim-patch:7.4.{951,1143,1144}'.

test/functional/legacy/057_sort_spec.lua

@@ -668,4 +668,22 @@ describe(':sort', function()
       b0b101100
       b0b111000]])
   end)
+
+  it('float', function()
+    insert([[
+      1.234
+      0.88
+      123.456
+      1.15e-6
+      -1.1e3
+      -1.01e3]])
+    execute([[sort f]])
+    expect([[
+      -1.1e3
+      -1.01e3
+      1.15e-6
+      0.88
+      1.234
+      123.456]])
+  end)
 end)

test/functional/legacy/function_sort_spec.lua

@@ -0,0 +1,29 @@
+local helpers = require('test.functional.helpers')
+local clear = helpers.clear
+local eq = helpers.eq
+local eval = helpers.eval
+
+describe('sort', function()
+  before_each(clear)
+
+  it('numbers compared as strings', function()
+    eq({1, 2, 3}, eval('sort([3, 2, 1])'))
+    eq({13, 28, 3}, eval('sort([3, 28, 13])'))
+  end)
+
+  it('numbers compared as numeric', function()
+    eq({1, 2, 3}, eval("sort([3, 2, 1], 'n')"))
+    eq({3, 13, 28}, eval("sort([3, 28, 13], 'n')"))
+    -- Strings are not sorted.
+    eq({'13', '28', '3'}, eval("sort(['13', '28', '3'], 'n')"))
+  end)
+
+  it('numbers compared as numbers', function()
+    eq({3, 13, 28}, eval("sort([13, 28, 3], 'N')"))
+    eq({'3', '13', '28'}, eval("sort(['13', '28', '3'], 'N')"))
+  end)
+
+  it('numbers compared as float', function()
+    eq({0.28, 3, 13.5}, eval("sort([13.5, 0.28, 3], 'f')"))
+  end)
+end)