I'm trying to define a decimal field with 0/zero decimal places, e.g. 00000001, to store a number with prefixed zeros/0's in MySQL DB. 

The XMLDB editor interface throws a missingparam (name) error.

A required parameter (name) was missing
Debug info:
Error code: missingparam×Dismiss this notification
Stack trace: * line 610 of /lib/moodlelib.php: moodle_exception thrown

• line 114 of /admin/tool/xmldb/actions/edit_table/edit_table.class.php: call to required_param()
• line 187 of /admin/tool/xmldb/actions/XMLDBAction.class.php: call to edit_table->invoke()
• line 110 of /admin/tool/xmldb/actions/load_xml_file/load_xml_file.class.php: call to XMLDBAction->launch()
• line 187 of /admin/tool/xmldb/actions/XMLDBAction.class.php: call to load_xml_file->invoke()
• line 113 of /admin/tool/xmldb/actions/save_xml_file/save_xml_file.class.php: call to XMLDBAction->launch()
• line 67 of /Users/richardwhitehead/Sites/MOODLE/moodleplugindev/public_html/admin/tool/xmldb/index.php: call to save_xml_file->invoke()

• XMLDB Editor field definition is as follows: 
• Name: anylowercasestring
• Comment: blank/any
• type: number
• length: 8
• Decimals: 0/blank (both produce the same error - using positive numbers removes the error, but I don't want decimal places).
• Not null: not null/null (doesn't affect issue)
• Sequence: No
• Default: n/a (have tried 00000001 or blank - doesn't affect issue).

Same field defined directly in module/db/install.xml:

<FIELD NAME="decimalcode" TYPE="number" LENGTH="8" NOTNULL="true" DEFAULT="00000001" SEQUENCE="false" DECIMALS="0"/>

my IDE codesniffer complains: The value '0' of attribute 'DECIMALS' on element 'FIELD' is not valid with respect to its type, 'positiveInteger'.