How to set up the chain at the first place?

[parzh]

At least two options are possible:

• Verbose:

  check.input(42).chain(logic);

• Compact:

  check.input(42)[logic]();

where logic may take one of the following string-values:

• "and" - conjuction;
• "or" - disjunction;
• "nor" - negated disjunction;
• "xor" - exclusive disjunction;

Both options may be used along one with another as alias to each other.