The automatic number of digits feature is generally very useful, but sometimes doesn't seem to make the right decision.
For example, in the following process, the examples range from 0 to 0.003, but the discretization bins are [-inf-0.0] and [0.0-inf].
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.2.008">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="5.2.008" expanded="true" name="Process">
<process expanded="true" height="672" width="988">
<operator activated="true" class="generate_data" compatibility="5.2.008" expanded="true" height="60" name="Generate Data" width="90" x="45" y="75">
<parameter key="number_examples" value="50"/>
<parameter key="attributes_lower_bound" value="0.0"/>
<parameter key="attributes_upper_bound" value="0.0040"/>
</operator>
<operator activated="true" class="discretize_by_frequency" compatibility="5.2.008" expanded="true" height="94" name="Discretize" width="90" x="246" y="75">
<parameter key="attribute_filter_type" value="single"/>
<parameter key="attribute" value="att1"/>
<parameter key="range_name_type" value="interval"/>
</operator>
<connect from_op="Generate Data" from_port="output" to_op="Discretize" to_port="example set input"/>
<connect from_op="Discretize" from_port="example set output" to_port="result 1"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="sink_result 1" spacing="0"/>
<portSpacing port="sink_result 2" spacing="0"/>
</process>
</operator>
</process>