groovy.json.JsonSlurper failes to parse decimal numbers correctly

slurper = new groovy.json.JsonSlurper()
assert slurper.parseText('{"number": 123456.123456789}') == [number: 123456.123456789]

assert slurper.parseText('{"number": 123456.123456789}') == [number: 123456.123456789]
       |       |                                         |
       |       [number:123456.125]                       false
       groovy.json.JsonSlurper@11346f77