less-than-gifted 是什么意思?

readok2009

However, if you have a complex function, and you suspect that a
less-than-gifted first-year high-school student might not even
understand what the function is all about, you should adhere to the
maximum limits all the more closely.


这是关于C 语言内function的叙述.
在这个段落之前有描述一些function的限制条件.
请问:
1.less-than-gifted 是什么意思?
2.you should adhere to the maximum limits all the more closely.
内all the more closely 是什么意思?