Missing implementation of LiteralExpressionMutator

[mutrepair]

Hi, your TBar tool is very useful and can fix a lot of bugs. But I found that there could be some implementation missing in the included fix patterns, e.g., LiteralExpressionMutator. I would assume this mutator can mutate string to another string (e.g., "") and mutate numbers to some other numbers (default ones like 0, 1 etc. or negated ones), but it seems the implementation is missing, according to your TODOs:

TBar/src/main/java/edu/lu/uni/serval/tbar/fixpatterns/LiteralExpressionMutator.java

Line 31 in 570c334

// TODO: How to select other string literals?

,

TBar/src/main/java/edu/lu/uni/serval/tbar/fixpatterns/LiteralExpressionMutator.java

Line 35 in 570c334

// TODO: How to select other number literals?

. Do you think TBar can fix more bugs if these mutators are fully implemented? Thanks for your time in advance.