The --start-subject flag does not work as expected with an exact subject

[dgollahon]

0 subjects are selected when --start-subject is given an exact class expression.

Examples from mutant itself (happens when using the normal mutant invocation on other projects as well, this was just easy to demonstrate):

Does not work properly -- it selects 0 subjects

./mutant.sh --start-subject 'Mutant::Mutator::Node::If' 'Mutant*' 

Works fine:

./mutant.sh --start-subject 'Mutant::Mutator::Node::If*' 'Mutant*'

Works fine:

./mutant.sh --start-subject 'Mutant::Mutator::Node::If#dispatch' 'Mutant*'

See this remark on discord and the conversation that precedes it.