Assemble method in BytecodeCompiler class should accept integer arguments for all opcodes

[lorenzogentile404]

BytecodeCompiler program = BytecodeCompiler.newProgram()
      .assemble(
        """
          PUSH1 28 ; 
          """);

is interpreted as PUSH1 0x28 instead of PUSH1 28. The purpose of the method is to write programs for testing using mnemonic instructions. However, it seems it accepts only hex inputs.