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The RFC limits the characters allowed in variables names, but there is no validation enforcing this.
From § 2.3:
variable-list = varspec *( "," varspec )
varspec = varname [ modifier-level4 ]
varname = varchar *( ["."] varchar )
varchar = ALPHA / DIGIT / "_" / pct-encoded
(I'm not opposed to expanding the set of allowed characters.)
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