...beware of newlines
This should be a sufficient warning to avoid such a solution. There's no chance to find out whether the following env output comes from two environment variables FOO and PERL5LIB or just from setting one variable with export FOO=$(echo -e "bar\nPERL5LIB=my/malicious/stuff"):
FOO=bar
PERL5LIB=/my/malicious/stuff
On Windows, the same misleading output can be created by typing the following (where <enter> is the "enter" key):
SET FOO=BAR^<enter>
<enter>
PERL5LIB=c:/my/malicious/stuff<enter>
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