According to errata item 2.21:

2.21. Section 13.6. Change meaning of textNumberCheckPolicy enum 'lax' to align with ICU.: "If ‘lax' and dfdl:textNumberRep is 'standard' then grouping separators are ignored, leading and trailing whitespace is ignored, leading zeros are ignored, quoted characters may be omitted."

I wrote two tests for the last part of that requirement, and they result in Parse Errors.

see tests test_textNumberCheckPolicy_lax01, test_textNumberCheckPolicy_lax05
in files:

daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section13/text_number_props/TextNumberProps.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section13/text_number_props/TestTextNumberPropsDebug.scala
daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section13/text_number_props/TestTextNumberProps.scala