StringConcatFactory improves startup speed and running performance through simpleConcat, but simpleConcat is currently given priority and only supports the following scenarios:

// x instanceof Object
prefix + x
x = subfix

// x instanceof Object && z instanceof Object
x + y

We can support more scenarios to improve startup performance and running performance, including:

// x instanceof byte/short/int/char/boolean/float/double
prefix + x
x + suffix

// x instanceof byte/short/int/char/boolean/float/double/Integer/Long/Object
prefix + suffix

// x instanceof Object
x + y + suffix

// x instanceof Object
x + y + suffix