Heed the order

The single most important thing to know about stdWrap is that all properties are parsed/executed exactly in the order in which they appear in the TypoScript Reference, no matter in which order you have set them in your TypoScript template.

Let's consider this example:

10 = TEXT
10 {
   value = typo3
   noTrimWrap = |<strong>Tool: |</strong>|
   case = upper
}

It results in the following:

<strong>Tool: TYPO3</strong>

The case property is executed before the noTrimWrap property. Hence only "typo3" was changed to uppercase and not the "Tool:" with which it is wrapped.