diff --git a/errors.lua b/errors.lua
index 1854dd4..52ffb48 100644
--- a/errors.lua
+++ b/errors.lua
@@ -107,19 +107,22 @@ local function handle_index_error (err_hdl, t, key)
     for k in pairs(t) do  keys[#keys+1] = k  end
     -- Is empty table?
     if #keys == 0 then
-        external_error(err_hdl, '', 'Attempting to index unknown key %s in an empty table.', key)
+        external_error(err_hdl, '', 'Cannot index unknown key %s in empty table.', key)
     end
     -- Is sequence?
     if #keys == #t then
         if type(key) ~= 'number' then
-            external_error(err_hdl, '', 'Attempting to index %s key %s, for sequence with length %i.', type(key), key, #t)
+            external_error(err_hdl, '', 'Cannot index %s %s, for sequence with length %i.', type(key), key, #t)
         elseif key == math.floor(key) then -- Integer
-            external_error(err_hdl, '', 'Attempting to index position %i, for sequence with length %i.', key, #t)
+            external_error(err_hdl, '', 'Cannot index integer %i, for sequence with length %i.', key, #t)
+        elseif key ~= math.floor(key) then -- Non-Integer
+            local format_code = (key == tonumber(tostring(key))) and '%s' or '%f'
+            external_error(err_hdl, '', 'Cannot index non-integer '..format_code..', for sequence with length %i.', key, #t)
         end
     end
     -- Is map?
     for i = 1, #keys do  keys[i] = tostring(keys[i])  end
-    correct_error(err_hdl, '', 'Attempting to index unknown key %s, maybe you meant %s?', tostring(key), keys)
+    correct_error(err_hdl, '', 'Cannot index unknown key %s, maybe you meant %s?', tostring(key), keys)
 end
 
 ----
diff --git a/test/test_errors.lua b/test/test_errors.lua
index 05bcc77..45acfe0 100644
--- a/test/test_errors.lua
+++ b/test/test_errors.lua
@@ -117,7 +117,7 @@ end)
 SUITE:addTest('Strict tables throw errors on unknown indices, even if table contains number keys', function()
 	local t   =  error.strict_table { 'hi', 'hello', 'world', aa = 1, ab = 2, ac = 3 }
 	local msg = bad_call(function() return t.a end)
-	assert_equal('[test_errors]: Attempting to index unknown key a, maybe you meant ac, aa or ab?', msg)
+	assert_equal('[test_errors]: Cannot index unknown key a, maybe you meant ac, aa or ab?', msg)
 end)
 
 SUITE:addTest('Strict tables throw specific error on empty table', function()
@@ -125,22 +125,28 @@ SUITE:addTest('Strict tables throw specific error on empty table', function()
 	bad_call(function() return t.hello end)
 end)
 
-SUITE:addTest('Strict tables throws errors on indexing strings in sequence', function()
+SUITE:addTest('Strict tables throws error on indexing strings in sequence', function()
 	local t   =  error.strict_table { 'turing', 'church', 'ada', 'hopper' }
 	local msg = bad_call(function() return t.hello end)
-	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Attempting to index string key hello, for sequence with length 4.', msg)
+	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Cannot index string hello, for sequence with length 4.', msg)
 end)
 
-SUITE:addTest('Strict tables throws errors on sequence under-access', function()
+SUITE:addTest('Strict tables throws error on sequence under-access', function()
 	local t   =  error.strict_table { 'turing', 'church', 'ada', 'hopper' }
 	local msg = bad_call(function() return t[0] end)
-	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Attempting to index position 0, for sequence with length 4.', msg)
+	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Cannot index integer 0, for sequence with length 4.', msg)
 end)
 
-SUITE:addTest('Strict tables throws errors on sequence over-access', function()
+SUITE:addTest('Strict tables throws error on sequence over-access', function()
 	local t   =  error.strict_table { 'turing', 'church', 'ada', 'hopper' }
 	local msg = bad_call(function() return t[7] end)
-	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Attempting to index position 7, for sequence with length 4.', msg)
+	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Cannot index integer 7, for sequence with length 4.', msg)
+end)
+
+SUITE:addTest('Strict tables throws error when indexing non-integer in sequence', function()
+	local t   =  error.strict_table { 'turing', 'church', 'ada', 'hopper' }
+	local msg = bad_call(function() return t[2.5] end)
+	assert_equal('./test/test_errors.lua:'..curline(-1)..': [test_errors]: Cannot index non-integer 2.5, for sequence with length 4.', msg)
 end)