data_transformations.md in smarter_csv-1.13.0

- old
+ new

@@ -24,10 +24,19 @@
 
 ## Convert Values to Numeric
 `convert_values_to_numeric` is enabled by default. 
 SmarterCSV will convert strings containing Integers or Floats to the appropriate class.
 
+Here is an example of using `convert_values_to_numeric` for numbers with leading zeros, e.g. ZIP codes:
+
+```
+  data = SmarterCSV.process('/tmp/zip.csv',  convert_values_to_numeric: { except: [:zip] })
+   => [{:zip=>"00480"}, {:zip=>"51903"}, {:zip=>"12354"}, {:zip=>"02343"}]
+```   
+
+This will return the column `:zip` as a string with all digits intact.
+
 ## Remove Zero Values
 `remove_zero_values` is disabled by default.
 When enabled, it removes key/value pairs which have a numeric value equal to zero.
 
 ## Remove Values Matching
@@ -42,9 +51,9 @@
 
 It can happen that after all transformations, a row of the CSV file would produce a completely empty hash.
 
 By default SmarterCSV uses `remove_empty_hashes: true` to remove these empty hashes from the result.
 
-This can be set to `true`, to keep these empty hashes in the results.
+This can be set to `false`, to keep these empty hashes in the results.
 
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