In addition...

print uses $, as a "field separator" (the string which goes between elements of the argument list). String interpolation of arrays uses $" for the same purpose.

The following one-liner prints the default value of these variables:

$ perl -e 'print qq{\$,="$," \$"="$""\n}'
$,="" $"=" "
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but when I print it to a text file, each value in the list has a space added to the front of it.

Actually, the spaces are in between list elements