I pay attention to punctuation in constructed languages too. One version of my desert language has dashes where the vowels would be, or a spear for a long vowel, with the vowel marker written above the line. That was the interim between not writing down the vowels at all and writing them as proper letters in line with the consonants. I also like putting reversed punctuation marks at the beginning of questions or exclamations, as Spanish does, which makes them easier to read.
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