VHDL springs off of ADA, so I wouldn't say it was specifically developed.
Anyway, ADA and VHDL are strongly typed, which incidentally works well with critical applications development such as hardware design.
VHDL springs off of Ada (not an acronym, no need to shout or to bring in the Americans with Disabilities Act into a discussion on programming) syntax, but not its semantics (or, its not a continuation of Ada semantics, it does borrow some of them).
PL/SQL (I've never used it) also borrows from Ada's syntax, but not its semantics in any comprehensive sense. This sort of thing was deliberate, similar to how Verilog borrows from C's syntax, or Java apes C's syntax, or JavaScript apes Java's (and C, indirectly). The goal was to extend something familiar with new semantics.
This is why if you want complete determinism, use VHDL. Unlike verilog, VHDL was developped specifically for describing hardware behavior.