using decimal value of waveform when visiting Record node to fix is…

…sues with rounding. (#602)

src/bloqade/codegen/common/assignment_scan.py

@@ -26,7 +26,7 @@ def __init__(self, assignments: Dict[str, numbers.Real] = {}):
     def visit_record(self, ast: waveform.Record):
         duration = ast.waveform.duration(**self.assignments)
         var = ast.var
-        value = ast.waveform(duration, **self.assignments)
+        value = ast.waveform.eval_decimal(duration, **self.assignments)
         self.assignments[var.name] = value
         self.visit(ast.waveform)